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 Sujet: average
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86 articles trouvés pour ce sujet.

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How many students passed the test? 2018-07-20
florian pose la question :
In Mr. Edgecomb's math class, 30 students took an exam on statistics. If the average passing grade was 84, the average failing grade was 60, and the overall average was 80, how many students passed the test?
Penny Nom lui répond.
How many pet dogs? 2017-09-26
Michelle pose la question :
In 2016 there were about 135 million households in the United States. 36.5% of the households own at least one dog. On average, these households have 1.6 dogs. How many millins of pet dogs were in the United States in 2016?
Penny Nom lui répond.
Average price 2017-09-15
Annette pose la question :
If I sold a widget at \$15.50 17.5% of the time and \$16.50 88.5% of the time what is the algebraic expression for that. How do I arrive at an average price
Penny Nom lui répond.
The average rate of change of cot(t) 2017-01-18
Brianna pose la question :
Hello! It's been a while since I've taken a math course, and I'm stuck on a problem in my calculus course.
The question is this:

Find the average rate of change of the function over the given interval.
h(t)=cot(t) a) [5pi/4, 7pi/4]

Penny Nom lui répond.
How can he raise his average to 90? 2015-12-29
Raj pose la question :
Harris has an 87 in a class where daily works count 20%, quizzes count 20% and tests count 60%.
If there are only two test scores what must the score on his second test to raise his average to 90?

Penny Nom lui répond.
Average rate for a return trip 2015-03-14
Michael pose la question :
Jeffrey drove to a town 25 miles away at an average speed of 50 miles per hour. The return trip along the same route took 20 minutes longer than the trip to town. Determine the average speed in miles per hour for Jeffrey's round trip.
Penny Nom lui répond.
A train from Vancouver to Whistler 2015-02-02
Tea pose la question :
Serena and Nina are taking a train from Vancouver to Whistler, a 160km trip. If the average speed is decreased by 16km/hr, the trip will be 1/2 hours longer. What is the average speed of the train? Thanks :)
Penny Nom lui répond.
The average of 9 numbers is 45 2014-09-12
rizza pose la question :
The average of 9 numbers is 45. If 90 and 88 are added to the set of numbers. What will be the resulting average?
Penny Nom lui répond.
The average age of a group of 10 students 2014-09-11
sujan pose la question :
The average age of a group of 10 students was 20. The average age increased by 2 years when two new students joined the group . What is the average age of the two new students who joined the group?
Robert Dawson and Penny Nom lui répond.
What is the average of first 100 even numbers? 2014-08-02
Faizan pose la question :
What is the average of first 100 even numbers?
Chris Fisher lui répond.
A word problem concerning averages 2014-07-26
Bernie pose la question :
The average weight of a team of children is 50kg, Todd who weighs 56 kg then joins the team. The average weight of the new team is 51. How many children in the original team?
Penny Nom lui répond.
Roy pose la question :
May I ask if it is correct to add the following with units included? Some tell me that the units cannot be included in the addition because we cannot add speed.
Harley Weston lui répond.
What was the class average? 2012-04-20
olwale pose la question :
a class which consist of 15 boys and 10 girls sit for a test. the average score of the boys is 20 and the girls' is 25. find the average score of the class.
Penny Nom lui répond.
Mean and Average 2012-01-03
john pose la question :
what is the difference between average and mean
Robert Dawson lui répond.
The average age of 300 cars 2011-11-22
Jason pose la question :
I have 300 used cars built from 1970 to 1980, I would like to know the average age by total volume. If I provide the qty built per year, can I determine the average age of the lot (300) by total volume?
 Total built Year built 50 56 30 10 30 25 64 9 12 14 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980

Thanks

Penny Nom lui répond.
The average speed for the whole journey 2011-10-30
a train travels 68 Km at an average speed of 51Km/h. It then travels another 20Km at an average speed of 40Km/h before reaching its destination. Calculate the average speed for the whole journey?
Penny Nom lui répond.
Find his income on the fourth week of August. 2011-03-22
Abeth pose la question :
The average weekly income of MJ for the first three weeks of August was 3,600 and his average weekly income for four weeks is 3950. Find his income on the fourth week of August.
Penny Nom lui répond.
Average speed 2011-03-07
West pose la question :
Calculate the distance (in km) that Larry runs if he maintains an average speed of 8km/hr for 45 minutes
Penny Nom lui répond.
The average over two semesters 2010-01-20
edy pose la question :
6 courses have an average of 100 in the first semester 5courses have an average of 90 in the second semester what is the average of the two semester , method of calculation , how come to have 95.4545
Penny Nom lui répond.
Average speed 2009-09-11
john pose la question :
Sally travels by car from one city to another. She drives for 20.0 min at 68.0 km/h, 40.0 min at 37.0 km/h, and 51.0 min at 77.0 km/h, and she spends 12.0 min eating lunch and buying gas.

What is the average speed for the trip?

Penny Nom lui répond.
Average speed 2009-08-20
Christina pose la question :
We ran 3.4 miles in 40 minutes. What was our average speed?
Leeanne Boehm lui répond.
Averaging percentages 2009-06-14
Alan pose la question :
Can you add percentages and then divide them by the number of percentages to get the average percentage. I.E day 1 100% day 2 100% day 3 95% average= 98.3%

is the above possible or is it not done, I have a dispute with a work colleague over this.

many thanks

Harley Weston lui répond.
Driving to school and back 2009-05-17
marylyne pose la question :
suppose you are late for school and you drive from your house at a constant rate of 70 mph.when class is over, you drive home at a more leisurely 50mph. what is your average speed?
Penny Nom lui répond.
Mean 2009-05-02
debra pose la question :
a hot dog sales per week monday, 100 = tuesday,87 = wednesday, 95 = thursday, 125 = friday, 210 = saturday, 250 = sunday, 57 = what is the mean sales per day?
Penny Nom lui répond.
Interest rate over two periods 2009-04-12
Kenneth pose la question :
Hello:

How is the average determined for the following amount if it earns compound interest?

Here are my calculations, but I'm not certain that they are correct: Initial amount invested \$500.00:

\$500.00 @ 5% = \$525.00.

\$525.00 @ -2% = \$514.50.

\$14.50/\$500.00 = 2.9% divided by 2 equals an average of 1.45%.

If this average, 1.45%, is correct, how can I use 5% and -2% to determine the same average? Is it possible?

Penny Nom lui répond.
A trip at two different speeds 2009-03-28
A student pose la question :
Good afternoon!

An automobile travels 4 hours at an average speed of 42MPH. How much longer must the truck travel at an average speed of 55MPH so the average speed for the total trip will be 50MPH?

Penny Nom lui répond.
Whitney's average test score was 79 2009-01-30
dawn pose la question :
After 5 tests, Whitney's average test score was 79. After she scored 85 on the 6th test. What was her new average?
Penny Nom lui répond.
Average and total 2009-01-10
cecil pose la question :
the average of six number is 84. what is the total
Stephen La Rocque and Penny Nom lui répond.
A weighted average 2008-11-27
Kenneth pose la question :
I am interested in determining the answers to the following question by using some type of weighted average:

An investor has \$30,000 to invest at simple interest in two accounts. One account earns 2% and the second earns 5%. How much must he invest in each account if his total return is 4% or \$1,200?

Penny lui répond.
The average height of an attic 2008-09-12
oliver pose la question :
I need to find out the average height of a specific volume/area.
a standard house shape side walls height 10m, height in centre of house 15m.
width 15m length 25m (the roof spans the width)
Within the house in the corner there is a (box shape) room which is 5m in height by 3m wide and 4 m long
How do i work out the average height of the space directly above the room (same floor area)?

Stephen La Rocque and Harley Weston lui répond.
What will be the resulting average? 2008-09-05
jean pose la question :
the average of 9 is 54.if 84 and 90 are added to the set of numbers ,what will be the resulting average?
Penny Nom lui répond.
The average rate of change 2008-03-29
Tom pose la question :
For the function x/3x-1 find the average rate of change between the interval x=1 and x=5?
Harley Weston lui répond.
Average and mean 2008-03-17
A student pose la question :
Mean and average are the same propeties of the set of elements, if there is average then why mathematician need the mean ?
Penny Nom lui répond.
Average speed up and down a hill 2008-03-09
Judith pose la question :
An old broken-down ar has to travel a two miles route, up and down a hill. Because it is so old, the car travels the first mile - the ascent - at an average speed of fifteen miles per hour. How fast must it cover the second mile - the decent - to achieve an average speed of thirty miles per hours? (There is a missing variable, but what is it?)
Penny Nom lui répond.
Stacks of blocks 2008-02-07
Tammy pose la question :
i need help for my son he is given 3 stacks of cubes. the 1rst stack has 3 the 2nd stack has 2 the 3rd stack has 4 the question is draw the stacks of cubes so they are arranged correctly to find the mean. what is the mean of the data?
Stephen La Rocque and Penny Nom lui répond.
How old is the 11th person? 2007-12-08
Jamie pose la question :
Ten people are in a room, and their mean age is 15. After another person enters the room, the mean age is now 18. How old is the person that walked in?
Jesse McLeod and Stephen La Rocque lui répond.
Six crates of cantaloupes 2007-11-05
BARBARA pose la question :
The average weight 6 crates of cantaloupes is 61 lbs, if 3 of the crates weigh 72, 59, and 70 lbs. which of the following could be the weight in pounds of the other 3 crates?
a. 49,59,60
b. 51,53,54
c. 53,57,58
d. 54,56,60
e. 57,57,57

Stephen La Rocque and Penny Nom lui répond.
The aggregate percentage for the year 2007-10-11
Lisa pose la question :
I would like to add up twelve percentages then divide it by 12 to get the aggregate percentage for the year. How do I accomplish this task? Thanks.
Penny Nom lui répond.
The average rate of change of a function 2007-10-11
vern pose la question :
Find the average rate of change of the function over the given interval. Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval. f(X)=sinX for the inverval [0,pi/6]?
Harley Weston lui répond.
calculating percentages for my class 2007-10-09
Cori pose la question :
I teach a class in which there are seven projects/quizzes worth 10% each, and the midterm and the final are each worth 15%. No problem figuring out their final grade, but I have to give a mid-term average, having only FOUR of the seven 10% things, and the midterm test. The closest I've come to an accurate "average" is to just add them together (as equals) and average them.
Victoria West & Harley Weston lui répond.
The change in an average 2007-08-19
farah pose la question :
the average height of a group of 25 students goes up by 2 cm when astudent of height 165 cm replaces a student from the group.what is the height of the boy who went out of the group?
Stephen La Rocque lui répond.
What was the average? 2007-08-08
Leroy pose la question :
A total of 50 juniors and seniors were given a math test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70. What was the average score for all 50 students who took the test?
Penny Nom lui répond.
Average annual earnings per share 2007-08-07
Arul pose la question :
A corporation with 5,000,000 shares of publicly listed stock reported total earnings of \$7.20 per share for the first 9 months of operation. During the final quarter the number of publicly listed shares was increased to 10,000,000 shares, and fourth quarter earnings were reported as \$1.25 per share. What are the average annual earnings per share based on the number of shares at the end of the year?
Stephen La Rocque lui répond.
Average speeds 2007-06-22
Dee pose la question :
A guy goes 3.1m a second for 29 seconds in a golf cart. He then walks 1.5 meters a second. How long does he have to walk to get the average speed of 2.1m a second?
Stephen La Rocque lui répond.
The "mode" of a set of numbers 2007-06-06
Anthony's mom pose la question :
we have a graph: Kindergarten has 1, 1st has 5, 2nd has 4, 3rd has 3
is the mode "1st grade" because there are more children in that grade?

Stephen La Rocque lui répond.
How to increase your average 2007-05-24
Janna pose la question :
after taking 4 quizes your average is 71 out of 100. what must your average on the next 5 quizes be to increase your average to an 81 out of 100?
Penny Nom lui répond.
Average 2007-05-06
michelle pose la question :
the average of x and y is 20. If z = 5, what is the average of x, y, and z.
Stephen La Rocque lui répond.
vince pose la question :
If your homework grades is only 15% of the total grades and with an average homework grade of 90% what is your earn point for the homework earn point = average times percent
Stephen La Rocque lui répond.
Producing chocolate bars 2007-04-26
anne pose la question :
If you have to produce an average of 114 bars of chocolate over 7.5 hours how many do you have to produce over 9.5 hours.
Penny Nom lui répond.
Approximate average speeds 2007-03-19
Anne pose la question :
A bicyclist pedaled up a 2 mile long hill averaging 4 miles per hour. Upon reaching the top, the bicyclist headed down a 6 mile descent averaging 26 mph. What was the bicyclist's approximate average speed? Thanks very much in advance!!
Stephen La Rocque and Penny Nom lui répond.
The average of 3 tests 2006-12-12
Charles pose la question :
If you average 84 on first three test and the first score was 67. The second score was 7 less than the third score. What was the score on the second and third test.
Stephen La Rocque lui répond.
Patricia pose la question :
Your quiz grades are 73, 75, 89 and 91. What is the lowest grade you can obtain on the last quiz and still achieve an average at least 85?
Stephen La Rocque and Penny Nom lui répond.
Power walking 2006-07-30
Wendy pose la question :
I have an exercise routine of 'power walking', approx. 5-6 days per week. I carry a pedometer with me during these walks so that I can keep track of the distance of each walk. I've created a weekly walking chart on my computer, so each time I get back from a walk, I enter my stats, such as kilometers and miles walked that day, as well as my start and finish time. At the end of each week, before I printed out my completed chart, I would calculate out what my average walking distance was, for that particular week.

At the end of each month, I would calculate:
[1] I'd add up my total kilometers and miles walked for that month. (a no brainer ~ I could do that one!)
**But also, I would work out the percentages of the following:
[A] What my average daily distance p/walk was, for that month
[B] What my average time spent, per walk was, for that month

Penny Nom lui répond.
The average of a function 2006-04-11
Justin pose la question :
Find the average value of the following function from x=0 to x=7 f(x)=3x+4
Penny Nom lui répond.
The average of monthly averages 2006-04-06
Ray pose la question :
I have the averages of some data in percentages. the data is rather large, how can i find the average of these averages without going back to the original data? Is there a Factor or Constant that i could multiply or devide or add and get the average of these averages without resorting to the raw data.
Steve La Rocque and Harley Weston lui répond.
Divide the product of three consecutive positive integers by their mean 2006-03-12
Sandy pose la question :
When I divided the product of three consecutive positive integers by their mean, I got 99. What is the smallest of the three numbers?
Stephen La Rocque lui répond.
The average of 4 numbers is 5. 2006-01-02
Sheri pose la question :
The average of 4 numbers is 5. I have 3 of the numbers already- 5,8,4,? How do i find out what the last number to give me the average of 5?
Penny Nom lui répond.
Mean and average 2005-12-22
Jerry pose la question :
This is just a question from a degreed engineer that has a "understanding" problem. please go to http://www.metrika.com/3medical/hemoglobin-m.html

At the end of the page they talk about "mean" vrs "average" there does appear to be a difference. What is it?

Harley Weston lui répond.
Mathilda and Matthew 2005-12-18
A student pose la question :

Question: 1) The average of 12 is 5. The average of of 8 of these numbers ia 6. What is the average of the other four.

2)Mathilda is playing a mathematical game with Matthew. Each player starts from a point, then moves in a straight line to a second point,then to a third and so on. The moves are not made randomly, but are determined by a mathematical rule. The object of the game is to find the rule. It is Mathilda's turn to move on the grid . She starts at point M (3,9), moves to point N (2,4) and then to point O (0,0). Given Mathilda's rule, what could be the coordinates of the next point to which she might move?

Penny Nom lui répond.
Half way between 2004-09-08
Ben pose la question :
Find the number halfway between the number shown

751,843

Penny Nom lui répond.
X bar 2003-11-04
mary pose la question :
Remind me what this means:

```    _
X
```

Andrei Volodin lui répond.
Means 2003-10-28
Abdu pose la question :

Question:
80,80,84,85,88,92,97,98

The average of the 8 numbers listed above is 88. Of the following which pair of numbers could be removed from the list without changing the average.

A. 80 and 97
B. 80 and 98
C. 84 and 92
D. 84 and 97
E. 85 and 92

Andrei Volodin and Penny Nom lui répond.
Averages of Averages 2002-12-21
Amy pose la question :
If in the month of October the % of Payments Received was 80.74% and in November it decreased to 69.36%. Can you take the 80.74-69.36/69.36 to get the % of difference. In otherwords can you take the % of difference when the numbers you are comparing are %'s????

Can you also take an average of an average? For example, average number of payments received in October was 25.00%, average number of payments received November was 50.00%, and the average number of payments received in December was 15.00%. Do you average (25.00%, 50.00% and 15.00%) or do you have to go back to the numbers that calculated the averages. For example, October 25.00% was based on 25 payments being received out of a possible 100. So instead of taking the average of the averages, do you take the average payments and the average customers over the 3 months and calculate the average???

Harley Weston lui répond.
Richard pose la question :
I'm using a grading program for the first time this year. (ok, that's not a question) I require my students to record their grades in a Scorekeeper when they get them back. I'd like to know if my students can keep up with averaging their grades just as the grading programs automatically averages them when I put them in the spreadsheet.
Penny Nom and Claude Tardif lui répond.
The mean distance travelled 2002-06-07
A student pose la question :
If Rosalia travels 1000 km
Sheree travels 280 km
Daniel travels 50 km
Mica travels 200 km
Connor travels 500 km
Eric travels 250 km
Hillary travels 300 km

What was the mean distance travelled?

How do you arrive at the answer?

Penny Nom lui répond.
The average of two averages 2002-05-22
RJ pose la question :
in a class with 22 students, the average garde on an exam was 68%, in another class with 32 students, the average grade on the same exam was 78%, what was the overall for the two classes? round your answers to the nearest whole number.
Leeanne Boehm lui répond.
Number conversions and averages 2002-02-03
A student pose la question :
A table has the measurements of 1.6m by 2m, how much material is needed to cover table? I converted to cm then multiplied but got an answer of 32000cm ,so I divide by 100 to get to metres - the answer was 320 which I know is wrong - please explain!!

Also I need to explain in my own words what an 'average' is and I am struggling.

Penny Nom lui répond.
The average of two polygons 2001-10-23
Irene pose la question :
How can I prove that the average of two polygons will give me another one?
Walter Whiteley lui répond.
What did the girls score on average? 2001-07-20
Rajesh pose la question :
The students of two schools were sitting the same test. The students attending the first school scored 74 on average; within this the average scores of the boys and the girls were 71 and 76, respectively. The corresponding scores in the other school were 84, 81 and 90, respectively. If the average score of all boys was 79, what did the girls score on average?
Penny Nom lui répond.
The average value of a continuous function 2001-05-08
Esther pose la question :
The average value of a continuous function y = f(x) on the interval [a,b] is given by ________________?
Harley Weston lui répond.
Average speed 2001-05-01
Tom pose la question :
A ship goes in one direction, west to Hawaii, at 20 nautical miles per hour and, because of the wind, makes the return trip at 30 nautical miles per hour. What is the average speed?
Claude Tardif lui répond.
Lots of coins 2001-04-26
A student pose la question :
I purchase 2 million coins at 9.75
I purchase 1 milion coins at 8
what is the formula to calculate my average cost?

Penny Nom lui répond.
A few problems 2001-04-22
Carol pose la question :
Hello I am a College student trying get through my elmentry concepts class. I am also working with the middle and elementry school student with their work. I was given a few problems to work on and i am having a hard time explaining them to students. DO you think you can help with a coupld of these questions!
Penny Nom lui répond.
Cincinnati to Winston-Salem 2001-01-23
Belinda pose la question :
Joan Bedney travels from Cincinnati to Winston-Salem at an average rate of 40 miles per hour and returns at an average rate of 60 miles per hour. What is her average speed for the trip?
Leeanne Boehm and Claude Tardif lui répond.
What is the difference between Mean and Average? 2000-12-13
Julie pose la question :
What is the difference between Mean and Average? My thinking is the average, is the equal to the sum of all numbers divided by the number of numbers added together. But the mean, I think should be calculated by adding the largest and smallest numbers in the set and them dividing by 2. (which is the point where 1/2 the numbers are higher and 1/2 the numbers are lower)
Patrick Maidorn and Penny Nom lui répond.
Expected number 2000-11-02
James pose la question :
1)There are 40,25,50 students in the traditional,reformed,and reformed traditional Calculas sections taught by three teachers. On one fine day the three sections congregate together to watch the NOVA video tape on Fermat's Last Theorem.

a) A student is randomly selected from he crowed of students.What is the expected number of students in the same section of this student?

****this question which i did not have any idea to do as follow for the part b
b) If one of the three teachers is selected at random, what is the expected number of students taught by is teacher?

Harley Weston lui répond.
Mr. Edgecomb's math exam 2000-09-17
Rachel pose la question :
In Mr. Edgecomb's math class, 30 students took an exam on statistics. If the average passing grade was 84, the average failing grade was 60, and the overall average was 80, how many students passed the test?
Penny Nom lui répond.
Sample variance 2000-04-16
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 n-1 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.
Word problems 2000-03-31
Amy pose la question :
Question:
1. a north bound train left at noon. four hours later a south bound train left the same station. at 5 o'clook they were 160 miles apart. what was the rate of both if the north bound train was going 20 miles faster than the other one.
2. clark's final exam was given 5 times the weight of the weight of a weekly test. the avgerage of 15 weekly test was 91. the overall weighted average was 85. what did he make on the final.

Penny Nom lui répond.
Travelling from A to B 2000-03-20
Matt pose la question :
A car is traveling from point A to point B. Point A and point B are 30 miles apart. A car travels 30 miles an hour from point A to point B and then goes back to point A. How fast does the car have to go back to average 60 miles an hour?
Claude Tardif lui répond.
.400 in Baseball 1999-12-15
Nieve Nielson pose la question :
I have several questions to ask about the probability of getting a .400 in baseball:
1. What is the probability of a baseball player hitting a .400 in one game, considering that the hitter is up to bat four times?

2. What is the probability of a baseball player hitting a .400 in a season, considering that there are 100 games in a season? With the first two questions in mind:

3. Considering that baseball has been around for about 100 years, about how many people should hit .400 inthat time?

Chris Fisher lui répond.
The sixth game 1999-11-16
Stephanie Sprunger pose la question :
Janice scored 18,21,27,16,and 19 points in five basketball games. How many points must she score in the next game to raise her average to 22 points per game?
Penny Nom lui répond.
The average rate of change of a function 1999-04-20
Tammy pose la question :
Suppose that the average rate of change of a function f over the interval from x=3 to x=3+h is given by 5e^h-4cos(2h). what is f'(3)? I would appreciate any help with this question.
Harley Weston lui répond.
The halfway mark 1999-04-20
Sherry & Tom McGee pose la question :
How do you figure the halfway mark between 1/3 and 2/3 as a fraction and a decimal point?
Penny Nom lui répond.
Prime dates 1999-03-25
Jessica Brown pose la question :
I'm asking how do you figure out all the prime numbers in a year and, whats the average amount of prime numbers per week.
Jack LeSage and Penny Nom lui répond.
Mean and Standard Deviation 1998-04-22
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.

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