







Le plus grand commun diviseur 
20091111 

Katie pose la question : Question: Pendant mon cours de MAT 1300, mon enseignant m'a posé la question suivante:
(a, b) = 12
(a², b) = 24
(b, 72) = ?
Pouvezvous m'aider s'ilvousplaît? Claude Tardif lui répond. 





quel sont les plus grands diviseurs communs? 
20050907 

Sylvain pose la question : quel sont les plus grands diviseurs communs? Claude Tardif lui répond. 





Lot size / acreage (more than three sides) 
20070511 

Martha pose la question : What is the lot size of the following dimensions equivalent to acre.
141.85 x 52.55 x 217.63 x 38.89 x 68.08 Penny Nom and Stephen La Rocque lui répond. 





Calculating volume of concrete, dirt, sand, anything. 
20061117 

Debbie pose la question : [This article contains a special calculator to help you find the volume (for example, the cubic yards) of material required to fill (or empty) a space if you know the length, width and depth.]
We are wanting to pour a 24'x30' slab that is 5" deep. How many cubic yards of cement do we need? Penny Nom lui répond. 





A rectangle and a circle 
20170812 

Ramzan pose la question : a diagram shows the shape of rectangular framework with length (2x+20)cm and with (y+10)cm . The outline is made of wire . If a circle with diameter 56 cm is to be made from the wire and the area of the rectangle is 420 square centimeter ,find the possible lengths and width of the rectangle Penny Nom lui répond. 





Ratios and proportions 
20170801 

khurram pose la question : what is ratio and proportion? please give a detailed note on this topic, i am really panic of these calculations Penny Nom lui répond. 





Squares and rectangles 
20170715 

Tront pose la question : So, there's a general rule that all squares are rectangles but not all rectangles are squares. Im trying to find a term that would describe this relationship. I've found that if all of A is B but not all B is A then I'd say that A is a subset of B, but is there a term that describes the relationship as a whole? I don't want to describe the components, I want to describe the relationship as a whole. Penny Nom lui répond. 





Of cows and men 
20170704 

Akash pose la question : In a group of cows and man the number of legs is 32 more than the twice the number of heads.The number of cows is? Penny Nom lui répond. 





Long division with decimals 
20170616 

Kenneth pose la question : Hello:
Why is it recommended to move the decimal from a divisor when dividing so that the divisor is a whole number?
I know how to divide by moving the decimal from the divisor, but I cannot explain the reason.
I thank you for your reply. Penny Nom lui répond. 





1 acre as a 2 foot wide strip of land 
20170425 

alan pose la question : How can one convert 2 acres (a square  area) of land into a strip of land that is 2 feet wide and (?) feet long? Penny Nom lui répond. 





Rational numbers between 2 and 3 
20170408 

Medha pose la question : Find 12 rational numbers between2 and 3 Penny Nom lui répond. 





The sum and difference of two numbers 
20170320 

Olivia pose la question : The sum of two numbers is 87 and their difference is 29. What are the two numbers Penny Nom lui répond. 





Tons of sand 
20170301 

Elizabeth pose la question : Hello my arena is 132.23 feet width by 132.23 feet length. I need to put 4 inches of sand. How many tons of sand do I need ? Penny Nom lui répond. 





Divisibility of 3n^5+7n 
20161214 

Parag pose la question :
Question from Parag, a student:
if n is a natural number,then 3n^5+7n is divisible by
a)2
b)3
c)5
d)7
i got the answer but still i need a valid alternate approach. Penny Nom lui répond. 





Profit and loss on two shirts 
20161206 

Mahesh pose la question : A man purchases one shirt and one TShirt for Rs. 6000. He sells the shirt at a profit of 20% and TShirt at a loss of 10%, as a result he gains 2% on whole transaction. what is the cost price of the TShirt ? Penny Nom lui répond. 





Gallons and cubic inches 
20161205 

Theresa pose la question : If I did not know the cubic inches in a liquid gallon how would I find it?
In other words what is the formula for this? Penny Nom lui répond. 





Standard form 
20160922 

anna pose la question : ok. i have b=2/3x+5/7. im supposed to change it to standard form. how do i do that? Penny Nom lui répond. 





The modulus of a complex number 
20160729 

Cheyenne pose la question : There's a question on my Summer Assignment I cant figure out. Here it is:
Find the absolute Value of the complex number. 5i
Please help? Penny Nom lui répond. 





The perimeter and area of a shape 
20160630 

Scott pose la question : If I have a 16 x 32 rectangle the square feet is 512. So if I take a rope 96 feet long , which is the lineal feet of the rectangle, and manipulate it to any shape I want does the square footage inside the rope stay at 512 square feet? Thanks in advance! Penny Nom lui répond. 





15.86 acres 
20160421 

Ronald pose la question : If a rectangular piece of land is 1320 ft. on one side, how many feet would be required on the other side to equal 15.86 acres? Penny Nom lui répond. 





The area and the perimeter of a rectangle 
20160412 

kimberly pose la question : is there a relationship between the are and the perimeter of a rectangle?
explain. Penny Nom lui répond. 





The area of a circle and a square 
20160410 

Richard pose la question : I cannot understand why if you have a perimeter say of 4 units as the circumference of
a circle then you reshape it into a square you lose very approximately some 20% of its
volume but the perimeter length stays the same.
Can you please explain this to me as to why the volume decreases. Penny Nom lui répond. 





Setting up a pool 
20160409 

BETH pose la question : i am trying to cover an area for a 15x15 foot round pool with play sand before I set up the pool. My playsand bag is 50 lbs , says it covers .5 cubic feet per bag. How many bags do I need? Penny Nom lui répond. 





20 mangoes 
20160401 

Mussharat pose la question : I have 20 mangoes and have to put them in 5 boxes such that
the numbers will be odd numbers.Also I can't cut or take the seed
out from the mango . What should I do. It's really confusing.
I'll be more than happy if you could help me. Penny Nom lui répond. 





A block wall 
20160315 

Robert pose la question : I have a wall 40 ft. long and 4 ft. tall as well as another one that is 30 ft by 3.5 ft. tall that I am trying to build. how many 6 inch by 12 inch landscaping blocks do I need? Penny Nom lui répond. 





Can you construct a regular 21gon? 
20160308 

Peter pose la question : hi, i know that if i use a compass to draw a circle, i can use the same setting to mark 6 intervals along the circle circumference, how would i go about marking out 21 equally spaced points around the circumference?
if there an online calculator i can us, or some other interesting trick?
tia
peter Robert Dawson lui répond. 





Complex numbers in standard form 
20160115 

Michael pose la question : express the following complex numbers in standard form (2+3i)+(52i) Penny Nom lui répond. 





Division and units 
20150908 

Kenneth pose la question : Hello:
Would there be a reason to divide a number without units by another number with units?
Here is an example:
35 divided by $5.00 or 35/$5.00
The answer cannot have units ($) because $5 X 7 does not equal 35 but instead $35.00.
$35.00 divided by 5 or ($35.00/5) and $35 divided by $5.00 or ($35.00/$5.00) make more sense.
I thank you for your reply. Robert Dawson lui répond. 





The diameter and circumference of a circle 
20150901 

Tracey pose la question : Hello,
I own a custom workroom, I am figuring out fabric quantities or an estimate. When
at the job site, I forgot to measure the diameter of the semi circle shape that I have to
make a cushion for!!!
If the circumference of the semi circle is 165" what would the diameter be, maybe half
this measurement????
I appreciate any help...I basically need the width from left to right to see if I can fit
the cushion on one width of fabric that is 52" wide! Penny Nom lui répond. 





Why is the area of square not conserved when it changes to a rhombus? 
20150628 

shubham pose la question : Why is the area of square not conserved when it changes to a rhombus, both have equal sides still rhombus have less area than square.?? Penny Nom lui répond. 





The intersection of a plane and a cone 
20150516 

Tom pose la question : Is there a way to derive an equation that describes the perimeter of the intersection of a plane and a cone regardless of the angle of the plane to the cone. Assume that the plane does not cut through the base of the cone, the x, y, z location of the vertex is known, the distance from the vertex to the plane through the axis is know., and that the angle of the cone is known. Chris Fisher lui répond. 





Expand and Simplify (3x+5)(5x9) 
20150423 

chloe pose la question : Expand and Simplify (3x+5)(5x9) Penny Nom lui répond. 





n^2 is a multiple of 100 
20150330 

Rahul pose la question : I have to prove that n^2 is a multiple of 100 is necessary or
Sufficient condition (or both) for n being multiple of 10 Penny Nom lui répond. 





A cone is 2/3 full of sand 
20141214 

Janice pose la question : A cone with a radius of 3.5 cm and a height of 12 cm is 2/3 full of sand.
What is the volume of the sand inside? Penny Nom lui répond. 





Shaking hands at a party 
20141203 

Nazrul pose la question : At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?
Please help me. Penny Nom lui répond. 





The density of sea sand 
20141102 

Lenny pose la question : Hi There,
I need to find out the the density of sea sand to convert one metric ton to cubic
meter as I am submitting for a tender which is in cubic meter but the requirement
is in metric ton. I searched through the web site but no density of sea sand is given
though there is specific Gravity of dry sand is available. I was given a density of
1.6 to work with. If that is true am I right to say that 1 cubic meter of sea sand is
equivalent to 1.6 metric ton? Please help as I am getting confused with what I am
able to find out on the web.
Thanks much in advance
Rgds
Lenny Penny Nom lui répond. 





4 card hands 
20141102 

Ronaldo pose la question : How many Mus hands (combination of 4 cards allowing repetitions)
can be made from a deck containing 8 types of cards?
RRRR, RRRC, RRRS, RRR7, RRR6, RRR5, RRR4, RRRA,
RRCC, RRCS, RRC7, RRC^, RRC5, RRC4, RRCA,
RRSS, RRS7, etc.
I think 330. If so, what is the formula? Penny Nom lui répond. 





A 10foot piece of PVC pipe 
20141021 

David pose la question : A plumber has a 10foot piece of PVC pipe. How many 9/5foot pieces can be cut from the 10foot piece ? Penny Nom lui répond. 





A fact family containing 4, 4 and 16 
20141014 

Leslie pose la question : I am helping my son and the question is 4,4,16 in fact family what does that mean Penny Nom lui répond. 





The perimeter of a parcel of land 
20140918 

Shirley pose la question : What is the perimeter of a parcel of land that is 564 acres square Penny Nom lui répond. 





Expand and simplify [x3][x+3] 
20140716 

symion pose la question : Expand and simplify [x3][x+3] Penny Nom lui répond. 





The number of standard deviations 
20140615 

Dawn pose la question : Suppose that, at a certain college, the average weight of all male students is 160 pounds with a standard deviation of 30 pounds. A certain male student weighs 145 pounds. Determine how many SD's his weight is above or below average. Penny Nom lui répond. 





Bags of sand 
20140606 

Robert pose la question : We have a section that is 20ft long by 14ft wide and 4inches deep, the bags of sand are
.5 cubic ft. How many bags of sand do we need to fill this space evenly. Penny Nom lui répond. 





A circle a square and a rectngle 
20140512 

mazhar pose la question : suppose the length and breadth of the rectangle are 5 cm and 10 cm respectively and M is a point along the corner of the circle. what is the radius of the circle?(diagram is given..but i didn't mention it..actually the diagram looks like a circle inscribed in a square and the right bottom corner one rectangle will be given ,it is touches to circle at a point M that I've already mentioned and the dimensions of that rectangle also I've mentioned) please help me out.. Penny Nom lui répond. 





2 rectangular prisms are similar by a scale of 0.75 
20140316 

gina pose la question : 2 rectangular prisms are similar by a scale of 0.75. The volume of the smaller prism is 27cm3 (cubed). How many cubic centimeters is the volume of the larger prism? Penny Nom lui répond. 





A boxandwhisker plot with one whisker 
20140109 

Susan pose la question :
Question from Susan, a teacher:
I read your answer to the question about could a box & whisker have NO whiskers.
It made sense to me. However I am preparing for my advanced class and I have a sample graph comparing box plots of data.
Several of the box have only 1 whisker. There is no explanation for this. Can you help me out. I cannot think of a data set that would produce this. Thanks! Penny Nom lui répond. 





Fractions and square roots 
20131204 

arionne pose la question : How do you solve a square root with improper fractions like 121 over 49 Penny Nom lui répond. 





A stem and leaf plot 
20131024 

mary pose la question : Hi
I'm trying to answer my child's question on stem and leaf plot. For grade 4, the question is where do you put 57 in this list
6 0
5 4 8 8 9 4 6 4 Penny Nom lui répond. 





Proportional rates 
20131010 

Varsha pose la question : A province's Ministry of Social services has found that both the number of people needing social assistance and the province's total expenditures on social assistance are proportional to the rate of unemployment. Last August when the provincial unemployment rate was 8.4 %, the province provided assistance to 89,300 individuals at a total cost of 4107.4 million. The forecast unemployment rate for next August is 7.9%. How many people can the province expect to need social assistance next August? What amount should the province budget for social assistance in August? Penny Nom lui répond. 





Equal ordinate and abscissa 
20130815 

sonit pose la question : the slope of tangent to the curve y=(4x^2)^1/2 at the point, where the ordinate and abscissa are equal, is Penny Nom lui répond. 





A mixture problem 
20130729 

Lucy pose la question : Hi,
For the following question:
Ten pounds of mixed nuts contain 50 percent peanuts. How many pounds of peanuts must be added so that the final mixture has 60 percent peanuts?(A) 2.5 (B) 5 (C) 6 (D) 10 (E) 12.5,
my math book gives my the following explanation: Try choice (C): 6 pounds of peanuts. The original 10pound mixture contained 50 percent peanuts, or 5 pounds. Now you have 11 pounds of peanuts in a 16pound mixture, more than 60 percent. This result automatically eliminates choices (D) and (E) as well.Why would this result automatically rule out D and E? How can you tell?
Thank you for taking the time to answer my question. Robert Dawson and Penny Nom lui répond. 





A 3 acre plot 
20130617 

Chad pose la question : I have 3 acres 100ft at the top and bottom what is the length of each side to make up the 3 acres Penny Nom lui répond. 





4 linear equations with 3 unknowns 
20130412 

Marian pose la question : how to solve for 3 unknowns in 4 simultaneous equations Penny Nom lui répond. 





The dimensions of a rectangle are in the ratio 5:3 
20130308 

SM pose la question : 4. The dimensions of a rectangle are in the ratio 5:3. If the longer side is 18 cm,
a) What is the length of the shorter side?
b) What is the area of the rectangle? Penny Nom lui répond. 





100 animals 
20130225 

Jessica pose la question : You have exactly $100.00 to spend. You must get 100 animals.
The chicks cost $0.10 each.
The pigs cost $2.00 each.
The sheep cost $5.00 each.
You must get some of each animal.
How many of each animal can you get? Penny Nom lui répond. 





A 2 acre plot 
20121022 

bob pose la question : If a plot of land on the south side is 290.16 feet wide, how many feet on the west and east side to the north to make a 2 acre plot?
Thank You Bob Penny Nom lui répond. 





GST in New Zealand 
20121010 

Colleen pose la question : I work out my claimable gst each month but need to know the total sales or purchases amounts for filling in my six monthly paper work. How do I do that. I tried doing the opposite of calculating the gst i.e. x3 and /23 but it is slightly different to my total. Penny Nom lui répond. 





Guess and Check 
20120924 

Myron pose la question : My daughter has homework involving Guess and Check. Her Math book is no help with the question in her homework so hopefully you can help me. Here's the question: "The sum of a number and it's double is 24. Use the Guess and Check method to find the answer".
Help!! Robert Dawson lui répond. 





How high must the trailer be filled with sand? 
20120806 

Deb pose la question : Your customer has ordered 67 cubic yards of sand. The inside dimensions of your trailer are 40 feet long by 7 feet wide by 9 feet high. How high must the trailer be filled with sand? (Round up to the nearest inch.) Penny Nom lui répond. 





A sand box with 14 sides 
20120710 

Tom pose la question : Want to build a sand box for a pool that is fourteen foot round wanted to make it in fourteen pieces of wood what angle would each piece be and how long would each piece be Harley Weston lui répond. 





An octagonal sandbox around a pool 
20120612 

Linda pose la question : My pool is 15 feet across and it is round.
How do I measure to cut wood to build a sandbox around it? was thinking it will look like an octagon.
Thanks Harley Weston lui répond. 





Expanded exponential form? 
20120612 

Ramon pose la question : express the numbers 990 614 000 005 in expanded exponential form. Harley Weston lui répond. 





Multiplying binomials 
20120514 

Jordan pose la question : How do I solve the equation:
3(x+4)(x6) Penny Nom lui répond. 





Gravel, sand, cement and an equilateral triangle 
20120321 

saheed pose la question : how many tonnes of gravel and sand,bags of cements will be required to concrete 5feet depth/deep of 4feet equilateral triangle? Harley Weston lui répond. 





Buying school supplies 
20120309 

Jada pose la question : Hi, my daughter is having difficulties with a problem she is in the 5th grade, and insisted that it was a guess and check problem, but she really doesn't understand, and I don't either. Can you help us out?
Danielle is buying school supplies. She
has $7.25 to spend.
Notebook: $0.75
Pencils: $1.95
Pens: $2.50
Planner: $5.00
Please help by explaining the guess and check strategy for a problem like this. Thank you. Penny Nom lui répond. 





Limits and composition 
20111230 

Rahul pose la question : I want to know about limit proofs of composite functions. Like limit of log of a function equals log of limit of the function Penny Nom lui répond. 





Expanded form 
20111012 

Chris pose la question : Write this number in expanded form
4 326 180 501
Thanks!!! Penny Nom lui répond. 





An exclusion zone around a triangle II 
20110503 

Aishwarya pose la question : A long time ago Mr gibson found an island shaped as a triangle with three straight shores of length 3km, 4km and 5km. He declared an exclusion zone around his island and forbade anyone to come within 1km of his shore. What was the area of his exclusion zone?
This question was answered but did not understand the explanation. Robert Dawson lui répond. 





Sample Standard deviation 
20110316 

Iris pose la question : Help please: me on this type of math problem I can get through step one after that I get lost. Maybe you can explain it to me in a easier way to get the correct results. I have read the examples, but I am still lost cannot move on until the next practice until I get this one
Sample standard deviation
The following are distances (in miles) traveled to the workplace by employees of a certain computer company.
15,29,32 28 18 28
Find the standard deviation of this sample of distances. Round your answer to at least two decimal places. Penny Nom lui répond. 





The equation of a circle 
20110214 

Cristela pose la question : find the equation and all the information in General Form and Standard Form of the Circle that will passed trough the point (2,3) (6,1) (4,3) Stephen La Rocque lui répond. 





Multiplication and order 
20110121 

Janet pose la question : IN A MULTIPLICATION SENTENCE BASED ON A DRAWING..IS THERE ANY ORDER FOR THE MULTIPLICAND ANG MULTIPLIER FOR THE ANSWER TO RIGHT? Robert Dawson lui répond. 





Four digits are to be randomly selected 
20110120 

sarahbear pose la question : Suppose four digits are to be randomly selected (repetitions allowed) Find the probability that
A. 5562 is selected
B.0000 is selected
C. All four digits are the same
D. 2 is the first digit selected Penny Nom lui répond. 





Mathematics and a musical dilemma 
20110119 

rahul pose la question : how is mathematics applied in entertainment? Harley Weston lui répond. 





A binomial random variable 
20101129 

yvette pose la question : a binomial random variable has a mean equal to 200 and standard deviation of 10. find the values of n and p. Penny Nom lui répond. 





Mathematics and medicine 
20101013 

Dixie pose la question : need equations used in medicine for medicine and intravenous administration Penny Nom lui répond. 





Thickness of sand 
20100707 

RHONDA pose la question : In an 18 x 33 ft area how much is 4 yards of sand in inches to cover this area. Penny Nom lui répond. 





A collection of baseball cards 
20100701 

Martha pose la question : Cody has a collection of baseball cards. Is it possible for him to
place the cards into 5 boxes so that exactly 3 of the boxes contain an
odd number of cards and the total number of cards in two of the boxes
is the same as the total number in the other 3 boxes? Explain. Robert Dawson, Penny Nom and Claude Tardif lui répond. 





Expand and simplify 
20100615 

Alaa pose la question : Expand and simplify
(x9)(x+2) Penny Nom lui répond. 





Roosters, hens and chicks 
20100610 

Kamarah pose la question : If a rooster is worth 5 coins and a hen is worth 3 coins and chicks 3 together are worth 1 coin, how many roosters, hen and chicks totaling 100 can be bought with 100 coins?
notes:
you must buy at least one of each type of fowl
no fractional fowl
chicks are purchased in multiple of 3
find 3 solutions Penny Nom lui répond. 





Standard Deviation from a Proportion 
20100608 

silvestre pose la question : A large company finds that approximately 17% of all purchases are returned for credit. If the company sells 100,000 different items this year, about how many items will be returned. Find the Standard Deviation. Janice Cotcher lui répond. 





Percentage increase 
20100520 

Rebecca pose la question : Question from Rebecca:
In 2008 my land was valued at $84,000. In 2009 my land was revalued at $235,000.00. What is the
percent increase between the two values? I want to be able to express "the
value was increased by x%." Harley Weston lui répond. 





Sand falling off a conveyer 
20100402 

Katherine pose la question : sand is falling off a conveyer onto a pile at the rate of 1.5 cubic feet per minute. The diameter of the base is approximately twice the altitude. At what rate is the height of the pile changing when it is 10 feet high? Penny Nom lui répond. 





How many 5 card hands in a deck of 52 have 2 aces and 3 other cards? 
20100323 

Travis pose la question : How many 5 card hands in a deck of 52 have 2 aces and 3 other cards? Penny Nom lui répond. 





The distance travelled by a minute hand 
20100306 

Patric pose la question : How much distance will the minutes hand of length 14mm of a clock
cover in moving from 5 to 10? Penny Nom lui répond. 





Standard form 
20100305 

Laura pose la question : How do I change 3y=4x+1 into standard Ax+By=C standard form. This is my son's schoolwork. I homeschool him. I got the answer to the problem as 3y=4x+1, but it needs to be written in standard form and I know it needs to read 4x3y=1, but how do I get that answer into standard form. I need to know how to explain it to him. Can you show me? Thank you so much. Penny Nom lui répond. 





2+3 =10 and 7+2=63 and ... 
20100301 

brenda pose la question : if 2+3 =10 and 7+2=63 and 6+5 =66 and 8 +4 = 96 then 9+7+ ??????
its driving me crazy !! Penny Nom, Claude tardif and Melanie Tyrer lui répond. 





Birds and cats 
20100213 

Sophia pose la question : While visiting a pet store, you notice that there are only birds and cats in the cages. You can't help but wonder how many of each animal there is in the yard. But when you ask the store manager how many of each animal he has, he refuses to give a direct answer. He says there are 16 animal heads and 42 animal feet. How many birds and cats are there in the pet store? It said to show all your work. Explain in words how you found your answer. Tell why you took the steps you did to solve the problem. Penny Nom lui répond. 





A snail on an elastic band 
20100203 

Joe pose la question : A snail starts crawling from one end along a uniformly stretched elastic band. It crawls at a rate of 1 foot per minute. The band is initially 10 feet long and is instantaneously and uniformly stretched an additional 10 feet at the end of each minute. The snail maintains his grip on the band during the instant of each stretch. At what points in time is the snail
(a) closest to the far end of the band, and
(b) farthest from the far end of the band? Robert Dawson lui répond. 





A pile of sand 
20091216 

Malik pose la question : Sand is leaking out of a hole at the bottom of a container at a rate of 90cm3/min. As it leaks out, it forms a pile in the shape of a right circular cone whose base is 30cm below the bottom of the container. The base radius is increasing at a rate of 6mm/min. If, at the instant that 600cm3 have leaked out, the radius is 12cm, find the amount of leakage when the pile touches the bottom of the container. Harley Weston lui répond. 





Three numbers that have the sum of 45 
20091204 

amanda pose la question : there are three numbers that have the sum of 45.The greatest of the three numbers is 2 greater than the least number.What are the numbers?what is the formula to get the answer? Penny Nom lui répond. 





Two movies in one day 
20091118 

jazzy pose la question : ann and tim saw two movies in one day.The two movies lasted 4hours long .One movie was an half hour longer than the other .How many hours did the shorter movie run Penny Nom lui répond. 





A minute hand 
20091105 

Pardha pose la question : A minute hand of table clock is 3cms long. How far its tip move in 20 minutes Penny Nom lui répond. 





Guess and check 
20091101 

Laura pose la question : There is a game at the fair in which you toss
balls into bowls to win fish. There are 52
bowls. The larger bows contain five fish, and
the smaller ones contain three fish. If there are
202 fish total, how many bowls of each size are
there?
Laura Penny Nom lui répond. 





Standard deviation 
20091027 

Reggie pose la question : After you have computed the standard deviation of a set of 40 scores, you discover that the lowest score is in error and should be even lower. Will correcting this error affect the standard deviation? Penny Nom lui répond. 





Guess and check 
20091027 

Eileen pose la question : Caslin has a total of 50 red beans and green beans. If she trades 1 red bean for 4 green beans, she will have 113 green beans, how may red beans and green beans does she have? Penny Nom lui répond. 





Sarim has $1 in coins. 
20091027 

Elizabeth pose la question : Here is the question asked: Sarim has $1 in coins. Onefifth of the coins are dimes, twofifteenths are nickels, and twothirds are pennies. Tell how many of each coin he has. I am not sure how to start this problem. Penny Nom lui répond. 





Chickens and pigs 
20090828 

David pose la question : A farmer has a number of chickens and pigs. There are 24 heads and 80 ft.
How many pigs and how many chickens are there? Robert Dawson lui répond. 





A degreaser for a fish tank 
20090723 

charlie pose la question : I have a tank that is 10 feet in diameter that I want to put floating degreaser in.The rate for the degreaser is 1/2 gallon per square foot of surface water.How do I figure out how many gallons I need? Penny Nom lui répond. 





Is one Infinity larger than another in the extended real number system? 
20090624 

Justin pose la question : Hello there, I was wondering if one infinity is larger than another in the extended real number system (just like in the transfinite ordinals and cardinals with respect to infinite sets) or are all infinities the same size in the extended real number system? Thanks sooo much for answering my question! I greatly appreciate it!
All the Best,
Justin Robert Dawson lui répond. 





The center of an ellipse 
20090421 

Nae pose la question : what is the ellipse center of 5x^2+3y^2=15 Stephen La Rocque lui répond. 





A perpendicular line in standard form 
20090421 

Kristy pose la question : Can you help me with this equation?
Find the equation, in standard form of the line perpendicular to 2x3y=5 and passing through
(3,2) With the equation in standard form with all integer coefficient. Stephen La Rocque lui répond. 





How many handshakes took place? 
20090415 

wm pose la question : Suppose every member of the House of Representatives shakes
hands with every other member exactly once.
How many handshakes took place ? Penny Nom lui répond. 





Zscore 
20090325 

Barb pose la question : I am having trouble finding information on a z score and the conversion to the number of standard deviations a z value can be away from the mean.
What exactly does that mean and what am I looking for?
Help Please. Harley Weston lui répond. 





Conversion factor 
20090323 

kab pose la question : Would like to photocopy a Landscape Design. What is the Conversion Ratio or magnification required to convert 1" = 10 feet to 1/4" = 1 foot? Harley Weston lui répond. 





License plates and poker hands 
20090314 

CC pose la question : You have a license plate it can have 6 numbers/letters you can use the numerals 09 and the letters AZ how many combos are possible and how did you figure it out?
Question 2,
Your dealt an Omaha hand You have KKKQQ, how many different hands can consist of the same cards. Harley Weston lui répond. 





The sum is 43 and the difference is 9 
20090302 

Teresa pose la question : Hi, My 10yo son came home with this two problems and we can't figure out how to solve them.
1. Find two numbers whose sum is 43 and whose difference is 9 and
2. Find two numbers whose sum is 25 and whose difference is 11..
Many thanks
Teresa Robert Dawson, Stephen La Rocque and Harley Weston lui répond. 





An octagonal landscaping frame 
20090301 

Richard pose la question : Hi
I am trying to put landscape timbers down in octagon shape that measures 6
feet across and outside measures 360 degrees.. The timbers are 4 inches by 4
inches. I need to know at what angle to cut boards and at what length i need to
complete octagon.
Thanking you in advance for your kind assistance.
Richard :) Harley Weston lui répond. 





wo consecutive numbers with a product of 9506 
20090225 

sofie pose la question : find two consecutive numbers with a product of 9506 Penny Nom lui répond. 





Nullity 
20090216 

Justin pose la question : What exactly does the term nullity mean in the context of transreal numbers invented by Dr. James Anderson?
Thanks for your help in answering this question!
All the Best,
Justin Robert Dawson lui répond. 





Randy' age and Mandy's age 
20090203 

carolina pose la question : Randy is 4 times as old as Mandy, in 12 years, Mandies age is half of Randy's . how old is each now? Penny Nom lui répond. 





The amount of concrete in a football stand 
20090130 

jacques pose la question : A football stand 150 yd long has 20 tiers of seats; each tier has a rise of 2ft and tread of 3ft.Its construction of reinforced concrete with a cross section as shown. Find the amount of the material used in its construction. Penny Nom lui répond. 





A seven card poker hand 
20090112 

Sean pose la question : from a standard card deck, seven cards are chosen at random.
find the probability that the set chosen contains exactly three of each
of two different face values.
the second part of the problem asks the probability that the card hand contains
exactly three 2's and exactly three 5's. Robert Dawson lui répond. 





An area of 64cm squared and a perimeter of 64 cm. 
20090107 

Dale pose la question : i need to draw an object that has an area of 64cm squared and a perimeter of 64 cm. Can you help me out...... Robert Dawson lui répond. 





Two numbers 
20081215 

HERB pose la question : I am thinking of two whole numbers. When I add them , their sum is 123. When I subtract the lesser number from the greater number their difference is 45. What are my numbers? Penny Nom lui répond. 





How many fourlegged animals are in the field? 
20081202 

evelyn pose la question : Some chickens, cows and sheep are in the field. Their number of legs is 12 more than twice their number of heads. How many fourlegged animals are in the field? Harley Weston lui répond. 





Sigma in a normal distribution 
20081118 

Justin pose la question : Suppose the random variable Y can be described by a normal curve with
Mu=40. For what value of the standard deviation is
P(20 less than or equal to Y less than or equal to 60) = 0.50
Justin Harley Weston lui répond. 





An algebraic exercise with fractions and radicals 
20081118 

Rubén pose la question : Question from Rubén, a teacher:
I have the ecuation:
U = [yb / (ab+a^2)]^1/2 + [ya / (ab+b^2)]^1/2
I know for sure this reduces to
U = [y (1/a + 1/b)]^1/2
but I cannot find a way to get into that result!
Thanks Rubén Osuna lui répond. 





How do I compare fractions and decimals? 
20081118 

Alexis pose la question : How do I compare fractions and decimals ? Penny Nom lui répond. 





The product of two numbers is 2400 
20081016 

belinda pose la question : The product of two numbers is 2400, one number is 20 more than the other number. what are the two numbers? Penny Nom lui répond. 





Related rates 
20081016 

Gisela pose la question : As sand leaks out of a hole in a container, it forms a conical pile whose
altitude is always the same as its radius. If the height of the pile is increasing
at a rate of 6 in/min, find the rate at which the sand is leaking out when the
altitude is 10in. Penny Nom lui répond. 





Finding the Raw Score for a Mean of 0 and Standard Deviation of 1 
20081002 

Anita pose la question : A variable Y has a distribution of mean of Y =80 and standard deviation of Y=36. Find the values of A and B for transforming y*=A +BY so that mean of y* =0 and standard deviation of y*=1. Janice Cotcher lui répond. 





Is it possible to a function to be both even and odd ? 
20080928 

Mohammed pose la question : Is it possible to a function to be both ( Even and Odd ) Harley Weston lui répond. 





The standard form Ax+By=C 
20080926 

Susan pose la question : I am having difficulty changing the pointslope form of the equation of the line yy1=m(xx1) to the standard form Ax+By=C. You must express A,B,C in terms of the constants m,x1,y1. I have been able to insert numbers and switch easily from the general to the point slope equation, but I am stumped on how to convert it this way. Penny Nom lui répond. 





Two consecutive numbers 
20080921 

tomas pose la question : what is the two consecutive numbers with a product of 4160? Penny Nom lui répond. 





The percentage of sand in a soil mixture 
20080905 

kristi pose la question : 2 m 3 of soil containing 35% sand was mixed
into 6 m 4 of soil containing 15% sand. What
is the sand content of the mixture? Penny Nom lui répond. 





A linear function 
20080807 

Warren pose la question : What are the conditions of the numerical coefficients of the standard form Ax+By=C in Linear Function?
How will you transform y=square root of 3 x + 1 in standard form Ax+By=C? Penny Nom lui répond. 





Limit as it Approaches Infinity 
20080729 

mary pose la question : i was trying to find the limit of this problem
the limit as x approches infinity of x minus cosx divided by x
lim xcosx/x
x>oo Harley Weston lui répond. 





Problems understanding math 
20080727 

Cindy pose la question : why do so many people have problems understanding math.
is it because at some point along the way they didn't fully understand
a concept and they then lose confidence. Learning math is cummulative so what you
don't learn at one point just gets more confusing as you move along. how do
we correct this? how can i help students in junior and senior high who do poorly in math. Stephen La Rocque and Victoria West lui répond. 





How much sand do I order? 
20080715 

jackson pose la question : We would like to put 2 inches of sand down. The pool is 24 feet.
How much sand will we need?
The person we spoke to yesterday was talking in tons, but on these sites it is
talking cubic yards or feet.
Please help. We would like to get the sand ordered so we can get the pool up! Harley Weston lui répond. 





How many handshakes take place? 
20080626 

Peter pose la question : Eight people of different heights are at a party. Each person decides to only shake hands with people shorter than him/herself. How many handshakes take place?
My math book says it is 0. Is it wrong? If so, what is the answer? Harley Weston lui répond. 





A five card hand of playing cards with all 4 tens 
20080625 

shari pose la question : of the 2598960 different five card hands from a deck of 52 playing cards. how many would contain all ten's? Janice Cotcher lui répond. 





I will be x years old in the year x squared 
20080622 

rachel pose la question : you probably know someone who will x years old in the year x squared. When was that person born? ha lui répond. 





2(x  1)^2 + 8 
20080612 

kasondra pose la question : y=2(x1)2[thats a square] +8 that need to be put in standard form
the answer is y= 2x2 4x + 6
i got y= 2x2 4x 4
i just don't get how my teacher got that answer Penny Nom lui répond. 





Filling a hole with sand 
20080605 

greg pose la question : I have a 18 ft. diameter circle and need to put 2 in. of sand in it i need to know how much sand in cubic yards and tons Harley Weston lui répond. 





.5 cu ft of sand to lbs. 
20080525 

rogersimmons pose la question : needtocovert .5 cu ft. of sand into lbs. Penny Nom lui répond. 





The standard form of an ellipse 
20080430 

Rebecca pose la question : I have to write the following equation into standard form of an ellipse:
9(X1)^2 + (Y+1)^2 = 1 Stephen La Rocque and Harley Weston lui répond. 





A 13 cubic foot cylinder filled with sand 
20080412 

Thomas pose la question : I have a 100 pound bag of sand. I need to know how much sand I will need to fill a 13 cubic foot cylinder Harley Weston lui répond. 





The angle between the hands on a clock 
20080404 

Kristin pose la question : The question I need help with is : Bobo looked at the clock at 1:25. What was the precise measure of the angle formed by the hour and minute hands of the clock? Assume that each of the clock hands moves at a constant rate continuously around the face of the clock. Thus, in any given fractional part of an hour, each hand will move that same fractional part of an hour's worth of movement. Stephen La Rocque lui répond. 





Expected value and standard deviation 
20080319 

Patrick pose la question : Heres a question i cant figure out:
a small airline company has only three flights per day. The number of
delayed flights per day is regarded as a random variable, and I'm
supposed to calculate the expected
value and standard deviation of the number of delays.
the probability distribution looks like:
No. of Delays: 0 1 2 3
Prob. of delay: 05. 0.3 .1 .1 Harley Weston lui répond. 





Time and a half 
20080301 

Travis pose la question : Bill receives time and a half for working overtime. If Bill is paid $55 for each hour of overtime, how much is his regular hourly wage? Stephen La Rocque lui répond. 





Handshakes at a twenty person party 
20080225 

Chris pose la question : Twenty people have gathered at a party. Find the number of handshakes when each person shakes hands with everyone else at the party. Penny Nom lui répond. 





The equation of a line 
20080217 

Jennifer pose la question : Given the point A(3,2)B(5,8) find the equation of the line AB ( in standard form ) Penny Nom lui répond. 





Numbers and Operations 
20080202 

Charlotte pose la question : On the TABE (Test for Adult Basic Education) test, one of the categories
is number operation. I would like to know what consist of number operation. Penny Nom lui répond. 





The standard form of a line 
20080130 

Thomas pose la question : I'm attempting to get this in standard form
slope=3;(1,5) Penny Nom lui répond. 





The standard form of a line 
20080124 

James pose la question : I need to put it in Standard from ax+by=c the problem is
(4,0); parallel to y=2+1 how can I put this in Standard from Stephen La Rocque lui répond. 





The equation of a line 
20080120 

Sara pose la question : The question is:
Write the equation of a line that is parallel to y=3x2 through the point (5,9).
I think the correct equation for this is y=3x+24.
But I have to write it in standard form, and I can't seem to figure out how to do that. Please answer soon! Thanks! Stephen La Rocque and Penny Nom lui répond. 





A 16 sided lot 
20080116 

R pose la question : I am having a land of 16 irregular sides i know all the length of the sides how to calculate the
area of the land Harley Weston lui répond. 





The standard normal distribution 
20071229 

GEORGE pose la question : Statistics texts state that in a normal distribution, 1 standard deviation covers 68%, 2SD 95% 3SD 99.7%. However, on looking at the tables for normal curve areas, the percentage for a z value of 1 is 84.13. 68 % of values are covered at a z value of 0.47. The discrepancies exist even for other values but are smaller. So why is the rule of thumb so different from the Table for Normal Curve areas? Harley Weston lui répond. 





Mean and standard deviation 
20071210 

Jamie pose la question : Let n be any odd whole number.
a) Which has the greater mean: the odd whole numbers from 1 to n, or the even whole numbers from 2 to n1?
b) Which has the greater standard deviation: the odd whole numbers from 1 to n, or the even whole numbers from 2 to n1? Penny Nom lui répond. 





Three consecutive numbers 
20071208 

Aris pose la question : The product of 3 consecutive numbers is 1716. Find their sum. Stephen La Rocque lui répond. 





Guess and check 
20071203 

Marissa pose la question : I was sent home with a guess and check work sheet. i am not sure how i am sopouse to do this.
a sleeping bag and 2 mess kits costs $37.00.A mess kit and two sleeping bags cost $56.00
what is the cost of one sleeping bag. Stephen La Rocque lui répond. 





A ttest 
20071120 

Rachel pose la question : I am wanting to use the ttest to find if temperature over a period of 5 days was significantly different to the mean temperature for that time of year. So i want to compare expected temps to actual temps. The problem is that because the expected temperature is the same for the 5 days it gives me a standard deviation of zero. Does this mean the ttest cannot be used because the ftest can't be calculated. If so is there an alternative test? Harley Weston lui répond. 





Standard deviation 
20071120 

Shahzada pose la question : when and why we use standard deviation in Data analysis? Harley Weston lui répond. 





Expand (a^4  b^4) 
20071117 

Saif pose la question : how would you expand (a^4  b^4) ??? Stephen La Rocque and Victoria West lui répond. 





Maximize his profit 
20071112 

apoorva pose la question : During the summer months Terry makes and sells necklaces on the beach. Last summer he sold the necklaces for $10 each and his sales averaged 20 per day. When he increased the price by $1, he found that he lost two sales per day.
a. Find the demand function, assuming it is linear.
b. If the material for each necklace costs Terry $6, what should the selling price be to maximize his profit? Penny Nom lui répond. 





6 consecutive multiples of 6 
20071111 

jeff pose la question : find 6 consecutive multiples of 6 whose sum is the least common multiple of 13 and 18 Penny Nom lui répond. 





Stem & Leaf Plots 
20071102 

Jen pose la question : Trying to help my Gr.4 son with his math and i am a little lost here are the
stem and leaf plots..
Stem Leaves
4 02
3 1226699
2 011255789
1 33357899
Stem Leaves
2 00011111223334455
1 range566788899
Question  How are the ranges for the stem & leaf plots different ? Penny Nom lui répond. 





Dividing a segment into 3 congruent parts 
20071030 

Carolyn pose la question : I am doing construction. I have a line segment drawn. I need to divide a segment into 3 congruent part. How do I do that? Penny Nom lui répond. 





Two mirrors 
20071024 

Peter pose la question : The reflecting surfaces of two intersecting flat mirrors are at an angle θ (0° < θ < 90°). For a light ray that strikes the horizontal mirror, show that the emerging ray will intersect the incident ray at an angle β = 180° – 2θ. Stephen La Rocque lui répond. 





The distance of the Andromeda Galaxy 
20071022 

ROLY pose la question : What is 2.5 million miles x 6 trillion miles (light year)
This is the distance of the ANDROMEDA Galaxy. Stephen La Rocque lui répond. 





the sum of two consecutive integers is 51 
20071017 

Keira pose la question : the sum of two consecutive integers is 51 Penny Nom lui répond. 





A stem leaf and plot with decimals 
20071012 

Brandi pose la question : My child came home with a worksheet regarding stem and leaf plot. I figured out how to work it with whole number but not with decimals. Can you tell me how to do this with stem and leaf graph? They are even asking for a conclusion on the information. This makes no sense to me. Please explain and send an example problem also.
Thank you! Harley Weston lui répond. 





Grouped data 
20071008 

Nimra pose la question : The following sets of data represent the distributions of
house prices in the northeast and southwest of a country.
Random samples of 100 houses were selected in each region.
(a) Calculate the mean, median and standard deviation for Harley Weston lui répond. 





2 aces and 3 kings 
20071005 

Becky pose la question : How many 5card poker hands consisting of 2 aces and 3 kings are possible with an ordinary 52card deck? Penny Nom lui répond. 





Maximizing profits II 
20071005 

a student pose la question : Suppose there are three firms with the same demand function. The function is Q=100040P. Each firm also a a cost function.
Firm 1: 4000+5Q,
Firm 2: 3000+5Q,
Firm 3: 3000+7Q.
What price should each firm charge if it wants to maximize profits. Harley Weston lui répond. 





Sum and difference of two mystery numbers 
20071004 

Donna pose la question : The sum of two numbers is 39. The difference is 11. What are the numbers? Stephen La Rocque lui répond. 





Gas and oil at a 50:1 ratio 
20071003 

Cindy pose la question : How much gas and oil do you put in a 1.7 litre jug at a 50:1 ratio? Stephen La Rocque lui répond. 





How many ten thousands makes one million? 
20071002 

Payton pose la question : how many ten thousands makes one million? Penny Nom lui répond. 





How many two digit numbers contain at least one 7? 
20070906 

Janet pose la question : How many two digit numbers contain at least one number seven? Penny Nom lui répond. 





Standard deviation 
20070905 

Ethan pose la question : Okay I have a question about standard deviation.
Can you tell me a five number set of data that will have a standard deviation f zero and how you know that? Stephen la Rocque lui répond. 





Standard deviation 
20070901 

Pat pose la question : I have looked over your math question and mines is not there. for a binomiial distribution with parmeter n and p, the mean is np and the standard deviation is np(1p). I understand how to get the np but not understanding how to get the (1p). For example np=(40)(0.48)(10.48)=3.160. How can I get the (10.48) answer please Harley Weston lui répond. 





32,648 square footage = how much land? 
20070822 

Elizabeth pose la question : 1. What amount of Land = an acre?
2. 32,648 square footage = how much land? Penny Nom lui répond. 





A statistics example 
20070802 

Claudia pose la question : A particular employee arrives to work some time between 8:00 am  8:30 am. Based on past experience the Company has determined that the employee is equally likely to arrive at any time between 8:00 am  8:30 am.
On average, what time does the employee arrive?
What is the standard deviation of the time at which the employee arrives?
Find the probability that the employee arrives exactly at 8:12 am?
Find the probability that the employee arrives between 8:20 am  8:25 am? Har lui répond. 





A football stand 
20070719 

jean pose la question : a football stand 150 yd. long has 20 tiers of seats; each has a rise of 2 ft. and tread of 3 ft. it constructed of reinforced concrete with a cross section of 36*54. find the amount of material used in its construction. Harley Weston lui répond. 





Calculating the area (acreage) of a four sided lot 
20070718 

A property owner pose la question : I have a real estate property and the lot size is something I need to find out. I know the lengths of the four sides, but it isn't a rectangle, it is an odd shape. How do I find the acreage? Stephen La Rocque lui répond. 





Algebraic EquationsAx+By=C 
20070702 

Juan pose la question : The general "Standard" form of an equation is Ax+By=C.
ReWrite this equation in slopeintercept (y=mx+b) form. Harley Weston lui répond. 





How many tons of sand? 
20070619 

Richard pose la question : I need to know how many tons of sand it would take to fill a container 20 feet
long, 20 feet wide, and 6 inches deep. I am not sure of the makeup of the sand as
far as dry, loose, wet, etc. If you could give me calculations of all the variants it
would be appreciated. Stephen La Rocque and Penny Nom lui répond. 





Standard Deviation 
20070613 

Adrian pose la question : If you are told that the mean salary of a certain group of workers is $30,000 with a standard deviation of $4000, what proportion of workers earn over $38,000? What proportion of workers earn less than $18,000? Assume the distribution of wages is normal. Stephen La Rocque lui répond. 





What are the odds that the selections were random? 
20070526 

alan pose la question : An employer must select three people for layoff from three groups. Group 1 has 4 members and the oldest member is selected. Group 2 has 7 members and the oldest member is selected. Group 3 has 2 members and the younger is selected. Assuming equal qualifications, what are the odds that the selections were random vs. biased as to age? What is the formula to determine this? Penny Nom lui répond. 





Normal distribution 
20070524 

Paula pose la question : Consider a data set that is normally distributed.
The mean of the data set is equal to 10,000.
a.) Suppose that, for this data set, 10,625 has a
"zvalue" = 2.5. Solve for the standard deviation of
the data set.
b.) Solve for the "zvalue" of 9,900. Penny Nom lui répond. 





Using a stem and leaf plot 
20070522 

Maegan pose la question : The students in Mr.Smiths PE class collected data on the number of sit ups the students were able to do in three minutes. Use the data to create a stem and leaf plot. What is the median for the class data? range? mode? Penny Nom lui répond. 





Converting mass of sand to volume (a sand ceremony) 
20070521 

Linda pose la question : I'm getting married. We are having a sand ceremony. The empty bottle we are using holds 800ml. I have bags of colored sand. Each bag is 30g. There is 7 people participating in this ceremony. What I need to find out is how many grams of sand i need for 7 people to participate to fill this jar. Penny Nom lui répond. 





Constant rate of sand falling in a cone 
20070520 

Nhi pose la question : Sand is falling into a conical pile . After 5 min. the pile has radius 24 and height 26 . After 7 min. tell how far the point c. is from the top of the cone (A). Stephen La Rocque lui répond. 





(3x2(x3)+2)(3x2(x3)+2) 
20070517 

Jeff pose la question : (3x2(x3)+2)(3x2(x3)+2) Penny Nom lui répond. 





Cubic feet of sand 
20070509 

Paul pose la question : I have an above ground pool that is 585 sq feet. I want to cover the bottom in 3 inches of sand. The sand supplier says I need about 6 cubic yards, based on your prior answers on this subject. I come up with 1.8 yards. What is the correct amount? Stephen La Rocque lui répond. 





Who was the mathematician that united algebra and geometry? 
20070508 

Victor pose la question : who was the mathematician that united algebra and geometry Penny Nom lui répond. 





A thousand, is it M or K? 
20070501 

Larry pose la question : I have heard that Million is annotated as MM. But Ihave heard two answers for Thousands (K, M). Which is correct? Penny Nom lui répond. 





Incremental standard deviation 
20070428 

Murtaza pose la question : Hi
In relation my question asked earlier, i would first like to thank you for the prompt reply. But it has not answered my query yet. Let me frame the problem again.
I have a mean value for N data items. (note that i know N but i donot know the distinct N data item values) Now the (N+1)th data item comes in and i calculate the new mean. (incremental method for that is simple). How do i calculate the new standard deviation. The formula you gave me requires me to read the data items once and at the end of the pass i will have have the standard deviation. But i need the STDDEV values at intermediate stages as well. Is it possible ?
Murtaza Penny Nom lui répond. 





How many tons of sand is needed 
20070425 

Jennifer pose la question : How many tons of sand is needed to cover 350 cubic square feet? Penny Nom lui répond. 





A boxandwhisker plot with no whiskers 
20070418 

Paula pose la question : Is it possible for a boxandwhisker plot to have no whiskers? 3 whiskers? Penny Nom lui répond. 





Intersection of a line and a circle 
20070412 

gaby pose la question : The sum of two numbers is 9. The sum of the squares of the two numbers is 41. Find the numbers. Steve La Rocque and Melanie Tyrer lui répond. 





A one pass calculation of standard deviation 
20070319 

Murtaza pose la question : Hi
I searched the listings but couldn't find what i am looking for. I have a dataset and i am allowed only 1 pass through it. At the end of this pass i must have the mean and standard deviation. Calculating the mean is easy as also demonstrated in your listings. I think the same can be done for standard deviation as well. But the doubt that i have is this : Will the calculated standard deviation be sequence dependent ? i.e. if i change the order in which the data items enter the system, will the std deviation also change ??
Thanks in advance
Murtaza Penny Nom lui répond. 





Nickels, dimes and quarters 
20070318 

Alexandra pose la question : Ellen has two more nickels than dimes and three more quarters than nickels. She has $3.35 in all. How many coins of each type does she have? Penny Nom lui répond. 





A stem and leaf plot 
20070314 

Hazel pose la question : Hi,
I wanna ask about my son's homework re: reading stem and leaf plots.
It's really hard for me to understand about this..please show me how.
Ex. Number of dogs competing in dog shows
Stem Leaf
1 62024
2 5295
3 166
4 05
1. What was the least number of dogs at a dog show?
2.What was the greatest number of dogs at a dog show?
3. How many dogs shows are reported in the stem and leaf plot?
thanks...Hazel Penny Nom lui répond. 





Concrete sand 
20070308 

david pose la question : Can you tell me how much 4 cubic yards of concrete sand ways in tons? THANK YOU. Stephen La Rocque lui répond. 





Chickens and cows 
20070208 

Norman pose la question : My grandson is testing me on a question he recently solved.
The question is "A farmer has cows and chickens  there are 252 heads and 81 legs  how many of each animal does he have?"
I immediately thought of the quadratic equations I learned 50 years ago at school, but cannot remember how to do it. It is further complicated by the fact that 1 animal must have 3 legs as the total number of legs is 81 (or perhaps he his trying to catch me out) Any helpful advice would be welcome.
Many thanks Norman Stephen La Rocque and Penny Nom lui répond. 





Guess and check 
20070117 

Gwen pose la question : scott has 13 music boxes that play either patriotic songs or holiday tunes.he has 5 more music boxes that play holiday tunes. how many of each kind does he have Penny Nom lui répond. 





Standard deviation 
20070115 

Kayleigh pose la question : After i have added up all the squared deviations what do i do???, what is meant by "divide by one less than the sample size" Stephen La Rocque lui répond. 





The absolute value of imaginary and complex numbers 
20061211 

Keith pose la question : i don't get how to find the absolute value of imaginary and complex numbers here is an examples from the text book the answers are given but they don't show the work so i can follow along just show me the work please and explain how it is done
problem 3+4i Stephen La Rocque and Penny Nom lui répond. 





The name of an equation 
20061113 

Lee pose la question : I am struggling to find the name of the following equation. I remember watching a TV programme introduced by Arthur C Clarke. The programme focused on an equation that gave a wonderful pattern that went on into infinity. Two maths professors discussed this equation.It was described as 'Gods equation' as it was compared to the shape of trees and other shapes in nature. It was named after the inventor/discoverer. If you have any ideas i would be most grateful. Penny Nom lui répond. 





Ratios, proportions and medicine 
20061025 

Steven pose la question : I don't understand why we need to learn about ratios and proportions because i want to become a doctor and i don't know if i'll ever use this type of math. Penny Nom, Claude Tardif and Walter Whiteley lui répond. 





How do you find the length and width of a rectangle if you know ... 
20061015 

Anne pose la question : How do you find the length and width of a rectangle if you know the perimeter of the rectangle is 48 m and the area is 144 m squared? Stephen La Rocque and Penny Nom lui répond. 





Standard deviation 
20061004 

Jennifer pose la question : I was wondering how to figure out a standard deviation if you only have the mean of the data and no other information? Stephen La Rocque lui répond. 





The area of my hand 
20061002 

Waikiki pose la question : is there a possible way for me to calculate the area of my hand (palm and fingers involved)? obviously it is curved and i can't find a way on how to solve it... Chris Fisher and Diane Hanson lui répond. 





Cubic yards of sand 
20060920 

Michael pose la question : How many compacted cubic yards of sand are there in 40 acres of land at a depth of 20 feet? Stephen La Rocque lui répond. 





Convert a standard form to a slope intercept form 
20060914 

Maiko pose la question : I need to know step by step procedures to convert a standard form to a slope intercept form? Penny Nom lui répond. 





10,000 Million sandwiches 
20060912 

A business person pose la question : One of our customers said that the UK sells "10,000 Million" sandwiches annually in their take away restaurants...
How many is this exactly? Stephen La Rocque lui répond. 





How many thousands are in ten million. 
20060824 

Echoe pose la question : How many thousands are in ten million. Stephen La Rocque lui répond. 





Cubic yards of sand 
20060526 

Steve pose la question : I need to cover an area with sand that is 30 feet wide and 60 feet long and I need the depth of the sand to be 1/4 inch thick. How many cubic yards of sand will I need? Penny Nom lui répond. 





Landscaping 
20060511 

Luke pose la question : HOW MANY CUBIC YARDS OF CONCRETE WILL IT TAKE TO FILL UP A BOX 20FT.X20FT.X6IN DEEP?
HOW MANY CUBIC YARDS OF CONCRETE WILL IT TAKE; I HAVE A 12FT.IN DIAMETER POND AND I WANT TO PUT A 3FT.SIDEWALK AROUND THE OUTSIDE OF IT? Stephen La Rocque lui répond. 





How many thousands make 1million? 
20060510 

Raj pose la question : How many thousands make 1million? Penny Nom lui répond. 





Absolute Value vs. Standard Deviation ? 
20060424 

Sonia pose la question : Why we don't just take the average of the absolute value of difference scores (use the mean deviation) to describe variability instead of calculating the standard deviation? Claude Tardif lui répond. 





Cubic yards of landscape stone 
20060419 

Janet pose la question : I need to spread landscape stone around my pool. A landscaper said I need 16 yards. What is the area of a cubic yard if I want the stone 3" deep? Stephen La Rocque lui répond. 





How many students and how many cookies are there? 
20060310 

Stephanie pose la question : A group of students is trying to evenly divide the cookies remaining from a bake sale. If each student takes three cookies, there are five cookies left. If each student takes four cookies, they are two cookies short. How many students and how many cookies are there? Penny Nom lui répond. 





Stemandleaf plots, boxandwhisker plots and medians 
20060221 

A student pose la question : explain which plot would be easiest to use to find the median....boxandwhiskers plot or stemandleaf plot Penny Nom lui répond. 





Outliers in a box and whisker plot 
20060219 

A student pose la question : i need help on determining if their is an outlier...i know how to find the median and the lower quartile and the upper quartile..but i don't understand about the outliers....please tell me if their is an outlier in this problem....the numbers are...63,88,89,89,95,98,99,99,100,100 Penny Nom lui répond. 





Whose photo is he looking at? 
20060219 

Adeyeri pose la question : Looking at a picture a man says, that the father of the person (in photo) is the son of my father. whose photo is he looking at? Penny Nom lui répond. 





How many beanbag animals does each friend have? 
20060209 

A student pose la question : Melissa has 1 more than twice the number of beanbag animals Rachael has. Latanya has a third as many bean bag animals as Melissa has. Together, the three friends have 38 beanbag animals. How many beanbag animals does each friend have? Steve La Rocque and Penny Nom lui répond. 





I need to order sand for playgrounds 
20060118 

Jody pose la question : I need to order sand for playgrounds. I have their square footage and the various depths of sand needed for each, but sand comes in tons.
What is the formula for converting square footage and depth to tons (for example: 6 inches of sand needed for a 200sq ft area = how many tons?) Penny Nom lui répond. 





Mrs. Faria lives on an island 
20051215 

Julie pose la question : Mrs. Faria lives on an island 1 km from the mainland. She paddles her canoe at 3 km/h and jogs at 5 km/h. the nearest drug store is 3 km along the shore from the point on the shore closest to the island. Where should she land to reach the drug store in minimum time? Penny Nom lui répond. 





A standard normal probability 
20051119 

Pat pose la question : Find the probability of Z when it lies between 1.10 and 0.36 Penny Nom lui répond. 





Two word problems 
20051114 

Jennifer pose la question :
1. Every other person on a school's parent advisory committee is surveyed to determine how many people support passage of a school bond to build a new elementary school. Is this a good sample? Why or why not?
2.What is the difference in elevation between the highest point in California,Mount Whitney,which towers 4421 meters above sea level, the lowest point in California,Death Valley, which lies 86 meters below sea level?
Harley Weston lui répond. 





Mario is 16 years older than his youngest sister, Mercedes. 
20051108 

Jennifer pose la question : Mario is 16 years older than his youngest sister, Mercedes. Together, their ages total 36 years . How old is each person? Paenny Nom lui répond. 





Guess and Check 
20051101 

Robin pose la question :
Greta has a vegetable garden. She sells her extra produce at the local Farmer's Market. One Saturday she sold $200 worth of vegetables peppers, squash, tomatoes and corn.
Greta received the same amount of money for the peppers as she did for the squash.
The tomatoes brought in twice as much as the peppers and squash together.
The money she made from corn was $8 more than she made from the other three kinds of vegetables combined.
How much did Greta receive for each kind of vegetable?
Penny Nom lui répond. 





A sum of 75 and a difference of 13 
20051030 

Vicki pose la question : Find two numbers that have a difference of 13 AND A SUM OF 75? We need to learn about the formula or procedure. Penny Nom lui répond. 





A random sample 
20051016 

Stu pose la question : If I have a set of data points (14 to be exact)of unknown pedigree from a large population, what tests can I apply to see if they constitute a random sample from the large population? Andrei Volodin and Penny Nom lui répond. 





Means of sample means 
20051012 

Fareeha pose la question : A population consists of six numbers 1,2,3,4,5,6
a) How many different samples of two numbers can be selected with replacement? and list them.
b) Calculate the mean and standard deviation of the population
b2) Calculate the mean and standard deviation of the mean of the samples.
c) Find the standard error of your estimated mean in question b2 and compare with the estimated standard deviation in b2. Penny Nom lui répond. 





There are 28 boys and girls in a class.... 
20051009 

Clement pose la question : There are 28 boys and girls in a class. Each boy collects 10 stamps and each girl collects 9 stamps. The boys have 90 stamps more than the girls. How many boy and how many girls are there? Penny Nom lui répond. 





Constructing figures 
20050920 

Kim pose la question : I would like to know how to draw different shapes:
Regular Octagon with sides of length, 1 unit
Equilateral Triangles, with sides of length 1 unit
Regular Hexagons, with sides of length 1 unit
Isoseles Triangles, with hypotenuse of length 1 unit
Penny Nom lui répond. 





A normal distribution problem 
20050808 

Brad pose la question : The life of a toy is normally distributed. Suppose 92.51% of the items lives exceeding 2,160 hours and 3.92% have lives exceeding 17,040 hours. Find the mean and the standard deviation. Penny Nom lui répond. 





Cubic yards of sand 
20050804 

Beth pose la question : I am trying to figure out how much sand I will need for ground cover under my children's playset. The area to cover is 30' x 30' and I want 4 inches of sand. Penny Nom lui répond. 





Cubic yards of sand 
20050427 

Renee pose la question : I need to find out how much sand I would need to order for the base of a horse round pen. The pen is 40 ft across and I would like a depth of 4 inches. I have to order the sand in cubic yards. Penny Nom lui répond. 





How much sand is in a pile? 
20050416 

Larry pose la question : I was wondering if there is a formula for determining how much sand would be in a pile. I am a student in medical school, and this is a bonus question for a test. I hope you can help me. Harley Weston lui répond. 





Standard deviation 
20050102 

Urial pose la question : Find the standard deviation of the given data set
To get the best deal for CD dealer, Jessica called eight appliance stores and asked the cast of a specific model. The prices she quoted are listed below.
$300, $203, $272, $332, $440, $119, $129,$254
Penny Nom lui répond. 





A standard deviation test 
20041109 

Karen pose la question : How do you compare to see if a sample standard deviation is different than the population standard deviation? I know how to compare means, but not standard deviations. Penny Nom lui répond. 





A five digit number 
20041006 

A parent pose la question : What is the 5 digit number in which the first 2 digits are the square of the 3rd digit and the last 2 digits are the square of the digit that is one less than the third digit? The sum of all the digits is 22. Penny Nom lui répond. 





Incremental variance 
20040923 

Carlos pose la question : I must keep statistical data (mean and variance) in 3 granularity levels depending on the age of the data (daily for older than 1 year, hourly for older than 1 month and quarterhour for older than 1 day). How can I calculate the resulting variance from a set of variances previously calculated supposing I have the count and mean for each member of the set? Andrei Volodin and Penny Nom lui répond. 





The price of a book 
20040918 

Dorly pose la question : If the number of toonies required to buy a book is nine more than the number of
fivedollar bills required to buy the same book, determine the cost of the book. Penny lui répond. 





The area of a lot 
20040822 

Cassie pose la question : I'm in the process of purchasing some land and I'm trying to figure out the square footage of the property. Unfortunately, it's be a while since I had to remember this type of formula. The property is 140 ft on left side, across the back it is 220.61 ft, the right side is 167.52 ft, the frontage is 105 ft. Penny Nom lui répond. 





Three dice 
20040510 

A student pose la question : If one has 3, 6 sided dice what is the probability of the numbers that are rolled to total 4 through 10 inclusively?
Subsequent to this, what is the probability to do this consecutively...say 3 times? Peny Nom lui répond. 





Billions and more! and even more! 
20040301 

Steph pose la question : What comes after undecillion? Penny Nom lui répond. 





Two consecutive negative integers 
20040117 

Amanda pose la question : Find two consecutive negative intergers whose product is 182. Penny Nom lui répond. 





A new way to measure randomness 
20031231 

Stephanie pose la question :
Last year, I did a science project in which I asked, "Which shuffles better, an automatic card shuffler or shuffling by hand?" To measure this I decided the "best" shuffler was the one to become random first. Last year, to measure randomness, I numbered cards 152 and had the subjects shuffle them until they broke up the rising sequences or reached 10 shuffles. (Usually 10 shuffles came first...) Anyway, I did the same thing with the automatic card shuffler, and, as hypothesized, the automatic card shuffler randomized the deck first.
This year, I have decided to continue the project. The problem is, I need a new way to measure randomness without the use of fancy computers or something. I have searched the Internet, I have posted my query on websites based on math, and I have searched the local library.
I have found many useful things on the Internet, but none of them can tell me a new way to measure randomness. I cannot do a perfect shuffle, and I am not terribly gifted in the art of using computers. If you have any information (anything will help) or advice, I would be greatly obliged. Andrei Volodin lui répond. 





Multiplier and multiplicand 
20031217 

Karen pose la question : The K5 curriculum states that at a grade 5 level students should "understand and use the terms multiplier, multiplicand" The curriculum defines 'multiplicand' as " a number being multiplied by another number. A factor." There is no definition given for 'multiplier'
Question: Define these words are they just other words for 'factors'. If so, how important is it that students use these terms? It would seem like 'factors' would be the better choice of words to use. If multiplcand refers to eg. the first factor in the equation and the 'multiplier' the seond term, (if in fact it does) is this not confusing for students when we teach them that multiplication is commutative? Penny Nom lui répond. 





The hour hand and the minute hand 
20031217 

Minnie pose la question : When you are looking at the clock at 12:00 the hour hand and minute hand are exactly together. (one on top of the other). Between 1:00pm and 1:15pm there is another time when the hour and minute hands are exactly together again. Penny Nom lui répond. 





Room and board fees 
20031129 

Jennifer pose la question : A certain university wishes to determine room and board fees for the next academic year. For the current year, the fee is $3600 per student and 1800 students are living in the residence halls. Past data suggests that for every $300 increase in the semester fee, 200 fewer students will choose to live in the dorms. There are also costs to the university associated with the residence halls. The fixed costs total $2,000,000 per semester. the variable costs are currently $1000 per student but will fall $100 per student for each decrease of 100 students. Your task is to help the university determine the optimal fee. Assume linear relationships between the number of students and the fee and between the number of students and the cost per student Penny Nom lui répond. 





5.75 acres of land 
20031128 

Susan pose la question :
We own 5.75 acres of land here in El Paso Tx.
Some one wants to buy all or some of our land...to build homes on...but.. I can't figure a few things
1. our land is Almost exactly 500x 500x500 x500 ft square proprty
based on this can you tell me the approx perimiter measurements of EACH acre
we wish to sell approx 1/2 of this 5.75 acres ...or a tad bit less.. these are all approx measurements
what I also need to know is.. how many 50ft x 100ft lots are in each (1 )Acre???
Penny Nom lui répond. 





The product of the page numbers 
20031107 

Morgan and Mom pose la question : You open a book and the product of the page numbers is 12,656. What are your page numbers? Penny Nom lui répond. 





Statistics from grouped data 
20031009 

Rebecca pose la question :
I have to use a suitable computer package (ie. Excel) to work out the mean and standard deviation of the following:
Price Range No of Houses No of Houses
£`000 Area 1 Area 2
45 and under 50 4 5
50 and under 55 7 12
55 and under 60 14 16
60 and under 70 19 18
70 and under 80 8 3
80 and under 100 5 2
I have used excel to work out mean and standard deviation before, but not in a more complicated example like this. Any advice on where to start would be greatly appreciated. Penny Nom lui répond. 





Standard Deviation 
20031007 

Rebecca pose la question :
I have a task to complete, which is to calculate the mean and standard deviation of something. I have done this but am then asked to write a short explanation of my findings.
I know what the mean is about, and I thought I knew what the standard deviation meant too  shows the variation from the mean. However, on a task I completed earlier the feedback I got said 'you need to tell us that it is talking about the middle 66% of the data'  that has thrown me, I don't understand that. Can anyone help me get my head round this??? Penny Nom lui répond. 





Notation 
20030915 

Kim pose la question :
Question: i have a couple of questions 1. write in standard form a)4x2x8 b) 5 to the power of 4 . . . Penny Nom lui répond. 





A ruler and compass construction 
20030629 

Mandy pose la question : I have been searching for instructions on how to do this using a compass. Can you please send instructions step by step on how to bisect a segment into any given number of segments. (example, a way that it will work for bisecting segment into 3, 4, or even 5 congruent parts) Penny Nom lui répond. 





The square footage of a section of land 
20030604 

Diane pose la question : We are trying to calculate the square footage of a section of land with the following dimensions:
One end is 100 feet. The other end is 105 feet.. One side is 350 feet and the other side is 372 feet. I calculated the area as 35,875 sq. feet, however, the brochure for the land says the area is 36,200 + sq. feet. Leeanne Boehm lui répond. 





Two piles of cards 
20030524 

Sam pose la question : A standard deck of 52 cards (26 red, 26 black) is separated into two piles, not necessarily equal in size. The first pile contains seven times as many black cards as red cards. The second pile contains a number of red cards that is a multiple of the number of black cards in that pile. How many red cards are in the first pile? Penny Nom lui répond. 





The square of my age was the same as the year 
20030414 

Pat pose la question : Augustus de Morgan wrote in 1864, "At some point in my life, the square of my age was the same as the year." When was he born? Penny Nom lui répond. 





Incremental standard deviation 
20030412 

Carlos pose la question : I need to calculate the standard deviation for a group of data, but I don't know in advance what is the mean. Is there a way to adjust the STDV for each datum without keeping all of the previous values? This is needed basicaly for performance, so I won't need to read twice the same data (spend processing time) nor save the previous values (spend memory). Andrei Volodin and Penny Nom lui répond. 





A handshake problem 
20030331 

Jaylan pose la question : Suppose you and your partner attend a party with n other couples. Several handshakes took place. No one shook hands with himself (or herself) or with their partner, and no one shook hands with the same person more than once. After all the handshaking was completed, suppose you asked each person, including your partner, how many hands they had shaken. Each person gave a different answer.
Determine how many hands did you shake and how many hands did your partner shake when n=5 Penny Nom lui répond. 





Hundreds, thousands, millions,... 
20030219 

Karissa and Jasmeen pose la question : hundreds, thousands, millions,  can you help us with the rest of this sequence  we are trying to find the largest number Penny Nom lui répond. 





Sasha's candies 
20030218 

Pat pose la question : Ticktactoe
Sasha and Trudy are playing ticktactoe. Sasha agrees to give trudy two pieces of candy for each game Sasha loses, and Trudy agrees to give Sasha three pieces of candy for each game that Trudy loses. After playing thirty games, Sasha has the amount of candy that he started with. If no ties occurred, how many games did Sasha win? Paul Betts lui répond. 





Dorothy and the wizard 
20030124 

Ken pose la question :
dorothy was going to see the wizard of oz...she stopped at the bakery and bought a box of cookies. she met the scarecrow and gave him half the cookies. she ate half of the remaining cookies and threw one half cookie away. she met the tin man and gave him half the cookies. she ate half the remaining cookies and threw one half cookie away. she met the lion. she gave him half of her cookies. she ate half the remaining cookies and threw the LAST half cookie away. how many cookies did dorothy leave the bakery with? Penny Nom lui répond. 





Jo's books 
20030121 

debra pose la question : Jo announces: I have no more than 999 books. Jean says: No Jo, You have fewer than 1,000 books. Mary says: Jo has at least 1 book.
Only one of these statements is true, How many books does Jo own?
I do not know HOW to approach this problem and solve it. Penny Nom lui répond. 





Cubic yards in a gravel pile 
20030110 

Ron pose la question : I am looking to find a way to measure gravel piles to get yards. They are generaly not square.it would be like pouring sand out of a bag into a pile. they generaly are concave in dimension. can you help. I have attached a picture to show a small scale what I am working on is in much larger volume. Harley Weston lui répond. 





Construct a pentagon 
20021212 

Mary pose la question : We were wondering what the instructions/formula, stepbystep, is to make a pentagon. Chris Fisher and Penny Nom lui répond. 





How many billions equal one trillion? 
20021207 

Ryan and Aylah pose la question : How many billions equal one trillion? We believe that the answer is one thousand times one billion equals one trillion. Please help us with the answer to this question. Penny Nom lui répond. 





Round to hundredths 
20021119 

Brittany pose la question : Can u tell me how to do a problem like this:
35 divded by 4.8= Round to hundreths. Penny Nom lui répond. 





Radicals with fractional radicands 
20021111 

A student pose la question : how do I simplify radicals with fractional radicands? ex. 7sqrt(2) + sqrt(50)  2sqrt(18) 10sqrt(3/5)  24sqrt(5/3) 3sqrt(2/9) + 1/2sqrt(32) + sqrt(9/8) Penny Nom lui répond. 





Variance 
20021029 

Ade pose la question : I am trying to solve a standard deviation question, I have 30 data points to use, should I group the data before solving for variance or should I just use the raw data. Andrei Volodin lui répond. 





Nixon, Jefferson, and Madison 
20021008 

Lisa pose la question : The longestlived US presidents are John Adams(age90), Herbert Hoover (also90), and Harry Truman (88). Behind them are James Madison, Thomas Jefferson, and Richard Nixon. The lattter three men lived a total of 249 years, and their ages at the time of death form consecutive odd integers. For how long did Nixon, Jefferson, and Madison live? Penny Nom lui répond. 





Sanding a wooden block 
20020907 

Wanda pose la question : If a wooden block, 2in height, 3in width, and 6in length is sanded and 1/8 of an inch is removed from the top and from the bottom, how much is the volume of the block decreased? Penny Nom lui répond. 





Dan is 4 inches taller than Mike. 
20020904 

A parent pose la question : Dan is 4 inches taller than Mike. Together they are 8 feet 8 inches tall. How tall is each boy in feet and inches. Penny Nom lui répond. 





Jack and Jill wrote letters 
20020619 

Angel pose la question : jack and jill each bought a stationary # of sheets of paper in each box were the same # of envelopes were the same jill wrote letters consisting of 3 pages jack wrote letters consisting of 1 page
when they wrote all letters jill had 50 envelopes left and jack had 50 sheets of paper left how many pieces of paper and how many envelopes? Leeanne Boehm lui répond. 





Constructing the square root of 3 
20020607 

Allan pose la question : I am a Math 7/8 teacher. I was wondering how you would show a student how to find the exact location of the square root of three on the number line using just a compass and a straight edge. Penny Nom lui répond. 





Probability and investment 
20020519 

Bally pose la question : Investors do not invest all their money in the investment predicted to be the best beuause it is too risky. an investor holds shares in three independent cmpanies. company A, Company B, compnay C. an analyst predicts the probability of profit increases for each company as follows. Company A:0.70 Compamy B:0.50 Compnay C:0.65 (a) If the analyst's predictions are true, what is the probability that all three comapanies show a profit incresse?
ANSWER: I try using vin diagram but it did'nt work, I dont know any other ways to solve this question (b) if the analyst's predictions are true, what is the probability that at least one comany shows a profit increase? Andrei Volodin lui répond. 





Day care 
20020513 

Sonam pose la question : In many familes, both parents work. as a result, there is increasing need for day care. data was collected; and in one year in Canada, approximately 32% of children aged 0 to 11 years were in day care for at least 20h per week. (a) what is the probability, in a random poll of 60 children form the age of 0 to 11, that more than 15 children are in day care at least 20 h per week? nearest tenth of one %
ANSWER: P(children are in daycare at least 20h)= 60/60C14 = to the answer (b) what is the probability, in a random pool of 60 children that fewer than 20 are in day care at least 20 h per week?
ANSWER: P= 20/60= 33.3% stay in day care for 20h per week, I dont know if these answers are right please help me out. Andrei Volodin lui répond. 





Some algebra 
20020511 

A student pose la question :
/x  2 ^4/x = 8
/ = square root sign ^ = 4th root of x
also, dividing 2x3 3 6x __________ 4 + 2x
the 2x3 is 2x to the third Penny Nom lui répond. 





Some 5 card hands 
20020328 

A student pose la question : From a standard deck of cards how many 5 card hands are possible consisting of a. exactly 4 hearts
b. two cards of one kind and three of another(like a full house). Penny Nom lui répond. 





Cube roots 
20020326 

Kathy pose la question : My son is in 4th grade and needs to simplify the cube roots of 216, 512 and 64. How does he do this with a regular calculator or without? Penny Nom lui répond. 





Range of values for standard deviation 
20020322 

Susan pose la question : What is the range of values for standard deviation? Is it between 0 and +3? Is it between +1 and +3? Andrei Volodin lui répond. 





A farmer takes 100 animals to the market to sell. 
20020219 

Ann pose la question : A farmer takes 100 animals to the market to sell. All are sold and $100 is earned. The prices were $5.00 per cow, $1.00 per sheep and $.05 per pig. At least one of each kind of animal was sold. How many of each kind of animal did the farmer take to market? Penny Nom lui répond. 





Can the standard deviation ever = 0? 
20020216 

Karen pose la question : If given a class of 30 people who take a test with a mean of 80. Can the standard deviation ever = 0? If so, why? Penny Nom lui répond. 





Normal distribution 
20020121 

Danielle pose la question : A teacher gave a test on which the students' marks were normally distributed, but the results were pathetic. The mean was 52% and the standart deviation was 12%. The teacher decided that the top 10% of the students should get A's, the next 20% should get B's, the next 40% should get C's, the next 20% should get D's, and the bottom 10% should get F's. To the nearest percent, what are the cutoff marks that will result in an A, B, C, D, and F? Penny Nom lui répond. 





For 7 the multiplicand is 143 
20011212 

Cory pose la question : For 7 the multiplicand is 143 I am asked to solve this, if you could help me it would be greatly appreciated! Penny Nom lui répond. 





Box and Whisker plots 
20011119 

Rod pose la question : In our Prealgebra course, we have been studying Box and Whisker plots. Recently, we learned how to decide whether a data point is an outlier or not. The book (Math Thematics, McDougall Littell) gave a process by which we find the interquartile range, then multiply by 1.5. We add this number to the upper quartile, and any points above this are considered to be outliers. We also subtract the number from the lower quartile for the same effect. My question: where does this 1.5 originate? Is this the standard for locating outliers, or can we choose any number (that seems reasonable, like 2 or 1.8 for example) to multiply with the Interquartile range? If it is a standard, were outliers simply defined via this process, or did statisticians use empirical evidence to suggest that 1.5 is somehow optimal for deciding whether data points are valid or not? Penny Nom lui répond. 





Renee, Paulo and Peter 
20011118 

Sue pose la question : Renee is 5 years older than Paulo. she is also 7 years older than Peter. The sum of their ages is 21. How old is each person. Penny Nom lui répond. 





Tenths, hundredths, and thousandths 
20011017 

Cheri pose la question : I would like the French terms for the decimal place values of tenths, hundredths, and thousandths. (I would be interested in the Spanish terms also if you had them.) Maria Torres and Claude Tardif lui répond. 





Joan and Jan work together 
20010926 

Karyna pose la question : Joan and Jan work together and they set up a bandstand in just 24 minutes, but if Joan does it by herself she takes 1 hour. How long would it take Jan to set up the bandstand by himself? Claude Tardif lui répond. 





Ciefficient of variation 
20010923 

Carmen pose la question : I have a question from my OAC finite class. I've come across a problem with the coefficient of variation. I have taught my students that there are no units for coefficient of variation and it can be expressed as a percent. So, for example, a set of data with mean of 5 and standard deviation of 100 would have a CV of 5%. But what happens in this situation: the mean is 4meters and the standard deviation is 0.7mm. Is the CV 1.75% or 0.00175% or 0.0175%? I've had some students change leave the units as is, change them both to mm or change them both to meters...so which is it and why? Penny Nom lui répond. 





Standard deviation 
20010922 

Doug pose la question : I was wondering if anybody knows who the founder of standard deviation was? Penny Nom lui répond. 





Standard angles 
20010805 

Nagaraj pose la question : Why 0^{o} , 30^{o} , 45^{o} , 60^{o} ,and 90^{o} are taken as standard angles in Trigonometry? Why can't we take some other angles as standard angles? Chris Fisher lui répond. 





Linear regression 
20010801 

A student and a mother pose la question : My mom is taking a correspondence course in Simple Linear Regression and Correlation Analysis and we've been arguing about the relationship between the correlation rxy and standard estimate of errorSy.x. I took statistics last year in high school and I remember something about the Sy.x being proportionate to the r. Are they inversely related, directly related, not related, or can only range from 0 to 1.00? Her book doesn't say very much and I believe they are inversely related. She says they're directly related. Chris Fisher and Penny Nom lui répond. 





Comparing means and standard deviations 
20010711 

Shelly pose la question : Is there a way to compare means and standard deviations that come from different size samples? Is there an equation that can normalize sample size? Andrei Volodin lui répond. 





Chickens and sheep 
20010531 

Monica pose la question : Farmer Bob of the Martian Colony counted his sheep and chickens in an unusual way. When he finished, he reported that he had counted 86 feet and 26 heads. Use a guess and check table to find how many sheep and chickens are owned by the famer. Paul Betts and Penny Nom lui répond. 





A pile of sand 
20010514 

Gul pose la question :
 Sand for use on icy roads is stored in a conical pile 14.2 m high and with a base diameter of 34.4 m
 calculate the volume of the pile
 if one sander can take 6.9 m of sand, how many sanders can be filled from the pile?
Penny Nom lui répond. 





Sigma 
20010331 

A student pose la question : What does the Sigma symbol mean in mathematics? Penny Nom lui répond. 





Stemandleaf plot 
20010329 

Kelly pose la question : I'm tutoring my 5th grade nephew, and he needs to correct test questions regarding a stem  and  leaf plot. He left his book at school and I'm not familiar with the term. Can you explain it to me so that I can help him? Penny Nom lui répond. 





4160 
20010307 

Jessica pose la question : The product of two consecutive page numbers in this book is 4160. What are the page numbers? Penny Nom lui répond. 





A four dimensional object 
20010214 

A student pose la question : Can you give me some examples of a four dimensional object you can find around your house? Harley Weston lui répond. 





Two questions 
20010104 

Justine pose la question : first: A diagonal of a rectangle is the square root of 13 meters and the area of the rectangle is 6 meters squared. What are the dimensions of the rectangle? last: Find the ordered triple of nonzero digits (A,B,C) for which (AA)squared=BBCC where AA and BBCC are respectively, twodigit and fourdigit baseten numerals. Penny Nom lui répond. 





Cats and dogs 
20001224 

A student pose la question : Brian has fourteen pets. All of his pets are cats and dogs. Brian has four more cats than dogs. How many dogs does he have? Penny Nom lui répond. 





Dividing fractions 
20001018 

Paula pose la question : Why do you have to change the division sign to a multiplication sign and invert the fraction that follows the division sign in order to get the answer to a division problem when you're working with fractions? Penny Nom lui répond. 





A conic in standard form 
20000518 

Tara McConkey pose la question : Im havign trouble converting the following conic to standard form, i know that the conic is a hyperbola but that is all 16x^{2}9y^{2}160x18y+247=0 Harley Weston lui répond. 





Uniting algebra and geometry 
20000416 

Beth pose la question : Who is the mathmatician that united algebra and geometry??? Claude Tardif lui répond. 





Sample variance 
20000416 

Jonathan Freeman pose la question : I was just reading your article entitled "A Note on Standard Deviation" I'm now teaching a unit on s.d. and my students were wondering why one uses a denominator of n for a population and n1 for a sample. I saw in your article that this is because "[the quantity] tends to underestimate sigma... and other technical reasons." To which my students again asked... "Why?" Could you please elaborate a bit on the "other technical reasons" perhaps in terms a high school senior (or their teacher...) could understand? Harley Weston lui répond. 





Box and whisker plots 
20000309 

Brett Blake pose la question : Do you have any information on Box and whisker graphs? Harley Weston lui répond. 





Factoring, primes, GCF and LCM 
20000227 

Ruth Kroek pose la question : My son is in grade seven, he has to do a Factoring Booklet the areas covered are:  Prime #'s
 Composite #'s
 Rainbow Factoring
 Finding Multiples (consecutive multiples)
 Finding GCF of 23 numbers uning Rainbow factoring
 Finding LCM of 2 numbers using consecutive multiples
 prime factor trees
 prime factor ladders
 finding GCF of 2 numbers using Prime number Method
Although his text 'Math Power' gives some information, we are at a loss .. Penny Nom lui répond. 





Frogs and lily pads 
20000123 

Nick pose la question : There are 5 lily pads and 4 frogs, 2 Red and 2 Green, how many moves does it take for them to swap sides? Answer: 8 I have a formula which will tell you how many moves it will take with different total numbers of frogs, it is [(F*F)/4]+F Where F is the number of red frogs add the number of Green frogs. This formula only works with numbers of frogs that are the same on each side. What I would like to know is why this formula works and why you have to divide it by 4? Penny Nom lui répond. 





Two candles 
19991124 

Skip Simpson pose la question : You have two candles the same length. They are lit at the same time. One burns down in 4 hours; the other in 5 hours. How long does it take before one candle is three times the length of the other candle? Walter Whiteley lui répond. 





Estimating the population mean 
19991113 

John Barekman pose la question : Statitistics: Estimating the population mean when the standard deviation is known: I am not sure which n to use in the formula for the confidence interval equation: x +/ z*(standard deviation/sqrt(n)) If we have data of ten people, and if we have the data of ten sets of ten people each, what is the difference in the n that we use? What is the difference between the standard deviation and the standard error? Are we using the number of sampling means or just the number of samples? Harley Weston lui répond. 





A donkey and his carrots  part 2 
19991002 

Sarah Klink and Brenda Gamble pose la question : Does anyone know the solution of the donkey who had to carry 3000 carrots to the market which was 1000 miles away? The donkey can only carry 1000 carrots at a time and he eats one carrot every mile he walks but this is only when he is carrying carrots. How many carrots can get to the market with the donkey carrying them? Claude Tardif lui répond. 





Stem and Leaf Plot 
19990914 

Jeanette Sovick pose la question : My 5th grade son brought home a math paper, the title of which reads, Reading StemandLeaf Plots...can you explain this so I can explain it to him...There is no book, his teacher just sent this practice sheet home for him to complete and I have no clue! Penny Nom lui répond. 





Y2K? 
19990903 

Mike Putzakulish pose la question : In Y2K, the "K" stands for thousand, but where did the "K" come from? I know it's not a Roman Numeral, but what is it?? Chris Fisher and Harley Weston lui répond. 





Invert and multiply 
19990828 

Debbie Walter pose la question : I have another question please, WHY do we invert and multiply when dividing fractions? I know that's what we do but WHY? What is the reasoning behind it? Penny Nom lui répond. 





Standard Deviation 
19990711 

Anthony Fama pose la question : I have seen several answers to this question: If one standard deviation represents 68% of the population, what does two, three, four and five sigma [std deviation] represent? As stated, I have seen several different answers and thus, the impetus for my question. Harley Weston lui répond. 





The three cousins 
19990601 

Irena pose la question : I have three cousins on my dad's side. The product of their ages is 84. Next year the youngest will be 1/4 the age of the middle cousin. In 2 years from now, the oldest will be twice the current age of the middle. What is the age of my oldest cousin? Harley Weston lui répond. 





Parallel and perpendicular lines 
19990423 

Crystal Pilling pose la question : My name is Crystal Pilling and I am in 9th grade algebra. We are currently studying parallel and perpendicular lines. I am having trouble with this problem: 3/4x  5y= 16, (5,6) I have to find a line that is perpindicular to this line on a graph. HELP ME PLEASE!!!!! Penny Nom lui répond. 





Standard Form 
19990330 

Pam pose la question : How do you put this equation into standard form? y=3.572x+5.409 Would you please put this equation in this form Ax+Dy+C=0 Penny Nom lui répond. 





A handshake problem 
19990105 

Nick Lam pose la question : There are 40 people at a party. 1 host couple, a mom and her daughter. There are 19 other guest couples, composed of moms and their daughters. The Host couple shakes hands with everyone except each other. Each guest mom shakes hands with everyone but their own daughter. Each guest daughter shakes hands with everyone except their own mom. A hand shake between two people is considered to be one handshake. HOW MANY HANDSHAKES ARE THERE? Penny Nom lui répond. 





Random 
19980915 

Hugh Ballantyne pose la question : I am an occasional teacher. Here is my question: Does the word "random" have a technical meaning in mathematics? Harley Weston lui répond. 





(1+z+z^2)^2 
19980910 

A.R. pose la question : These questions deal with factoring. (1+z+z^2)^2 and (p^2pq+q^2)^2 I partially understand the second line which would be 1+z^2+z^4+2z+2z^2+2z^3 but I don't understand where the 2 comes from in the second half of that line. p.s.(^2 means squared or cubed etc.) Please help me out A.S.A.P.! I have a quiz on this tomorrow! Thankyou, A.R. Harley Weston lui répond. 





Frieze Patterns 
19980819 

Brian Bairstow pose la question : I am doing a research project on frieze patterns (also called band patterns or border patterns). I know that there are exactly seven different types of frieze patterns, but I have been unable to find a proof for this. If you could tell me this proof, or tell me some internet sites on which I can find material on this, I would be very grateful. Chris Fisher lui répond. 





Mean and Standard Deviation 
19980422 

Kit pose la question : i have a problem of maths. i think the level of the question is secondary. question: Find the mean and the standard deviation of the numbers:1, 3, 4, 5, 7. i hope u solve this question. thank you so much! Harley Weston lui répond. 





Hour Hand Movement 
19980419 

Chris and Angela Bradley pose la question : My wife and I are haveing an argument over the answer to this question, what is the total number of degrees through which the hour hand of the clock moves in 3 hours and 18 minutes? Thanks in advance. Chris Fisher lui répond. 





Guess and Check 
19971125 

Don Ramey pose la question : Hope you can help !!!! my daughter is in the 4th grade.. she has brought home a homework paper and the subject is problem solving. she does not understand what is expected of her. I have tried to help, but I do not understand either. She is to use the Guess and check Strategy. Ben knows 100 of his neighbors by name. Ten are fish. The rest are frogs and turtles. He knows the names of twice as many turtles as frogs. How many turtles does he know by name.? Please help by explaining the guess and check strategy for a problem like this. Diane Hanson lui répond. 





The Central Limit Theorem 
19970421 

Donna Hall pose la question : A skeptic gives the following argument to show that there must be a flaw in the central limit theorem: We know that the sum of independent Poisson random variables follows a Poisson distribution with aparameter that is the sum of the parameters of the summands. In particular, if n independentPoisson random variables, each with parameter 1/n, are summed, the sum has a Poisson distributionwith parameter 1. The central limit theoren says the sum tends to a normal distribution, butPoisson distribution with parameter 1 is not normal. What do you think of this argument? Neal Madras lui répond. 





Smith, Rodriguez and Jones 
19961107 

Rafayel Ambartsumyan pose la question : On a train, Smith, Rodriguez, Jones are the fireman, brakeman, and engineer, but not in that order. Also aboard the train are three businessman who have the same names, a Mr. Smith, a Mr. Rodriguez, and a Mr. Jones. ..... Who is the engineer? Penny Nom lui répond. 





Thousands, millions, billions and trillions 
19960822 

Blaine pose la question : What are the names of the periods in groups of numbers like 123,456,789. I need to know the names of them for school. I already know the first ones: units thousands millions billions trillions. Penny Nom and Diane Hanson lui répond. 

