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	Standard form		2016-09-22
		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.
	Complex numbers in standard form		2016-01-15
		Michael pose la question : express the following complex numbers in standard form (2+3i)+(5-2i) Penny Nom lui répond.
	The number of standard deviations		2014-06-15
		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.
	Sample Standard deviation		2011-03-16
		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		2011-02-14
		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.
	Standard Deviation from a Proportion		2010-06-08
		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.
	Standard form		2010-03-05
		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 4x-3y=-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.
	Standard deviation		2009-10-27
		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.
	Is one Infinity larger than another in the extended real number system?		2009-06-24
		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		2009-04-21
		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		2009-04-21
		Kristy pose la question : Can you help me with this equation? Find the equation, in standard form of the line perpendicular to 2x-3y=-5 and passing through (3,-2) With the equation in standard form with all integer coefficient. Stephen La Rocque lui répond.
	Z-score		2009-03-25
		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.
	Sigma in a normal distribution		2008-11-18
		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.
	Finding the Raw Score for a Mean of 0 and Standard Deviation of 1		2008-10-02
		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.
	The standard form Ax+By=C		2008-09-26
		Susan pose la question : I am having difficulty changing the point-slope form of the equation of the line y-y1=m(x-x1) 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.
	A linear function		2008-08-07
		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.
	-2(x - 1)^2 + 8		2008-06-12
		kasondra pose la question : y=-2(x-1)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.
	The standard form of an ellipse		2008-04-30
		Rebecca pose la question : I have to write the following equation into standard form of an ellipse: 9(X-1)^2 + (Y+1)^2 = 1 Stephen La Rocque and Harley Weston lui répond.
	Expected value and standard deviation		2008-03-19
		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.
	The equation of a line		2008-02-17
		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.
	The standard form of a line		2008-01-30
		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		2008-01-24
		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		2008-01-20
		Sara pose la question : The question is: Write the equation of a line that is parallel to y=3x-2 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.
	The standard normal distribution		2007-12-29
		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		2007-12-10
		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 n-1? b) Which has the greater standard deviation: the odd whole numbers from 1 to n, or the even whole numbers from 2 to n-1? Penny Nom lui répond.
	A t-test		2007-11-20
		Rachel pose la question : I am wanting to use the t-test 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 t-test cannot be used because the f-test can't be calculated. If so is there an alternative test? Harley Weston lui répond.
	Standard deviation		2007-11-20
		Shahzada pose la question : when and why we use standard deviation in Data analysis? Harley Weston lui répond.
	Grouped data		2007-10-08
		Nimra pose la question : The following sets of data represent the distributions of house prices in the north-east and south-west 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.
	Standard deviation		2007-09-05
		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		2007-09-01
		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(1-p). I understand how to get the np but not understanding how to get the (1-p). For example np=(40)(0.48)(1-0.48)=3.160. How can I get the (1-0.48) answer please Harley Weston lui répond.
	A statistics example		2007-08-02
		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.
	Algebraic EquationsAx+By=C		2007-07-02
		Juan pose la question : The general "Standard" form of an equation is Ax+By=C. Re-Write this equation in slope-intercept (y=mx+b) form. Harley Weston lui répond.
	Standard Deviation		2007-06-13
		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.
	Normal distribution		2007-05-24
		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 "z-value" = 2.5. Solve for the standard deviation of the data set. b.) Solve for the "z-value" of 9,900. Penny Nom lui répond.
	Incremental standard deviation		2007-04-28
		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.
	A one pass calculation of standard deviation		2007-03-19
		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.
	Standard deviation		2007-01-15
		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.
	Standard deviation		2006-10-04
		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.
	Convert a standard form to a slope intercept form		2006-09-14
		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.
	Absolute Value vs. Standard Deviation ?		2006-04-24
		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.
	A standard normal probability		2005-11-19
		Pat pose la question : Find the probability of Z when it lies between -1.10 and -0.36 Penny Nom lui répond.
	Means of sample means		2005-10-12
		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.
	A normal distribution problem		2005-08-08
		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.
	Standard deviation		2005-01-02
		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		2004-11-09
		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.
	Incremental variance		2004-09-23
		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 quarter-hour 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.
	Statistics from grouped data		2003-10-09
		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		2003-10-07
		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		2003-09-15
		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.
	Incremental standard deviation		2003-04-12
		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.
	Variance		2002-10-29
		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.
	Day care		2002-05-13
		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.
	Range of values for standard deviation		2002-03-22
		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.
	Can the standard deviation ever = 0?		2002-02-16
		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		2002-01-21
		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.
	Ciefficient of variation		2001-09-23
		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		2001-09-22
		Doug pose la question : I was wondering if anybody knows who the founder of standard deviation was? Penny Nom lui répond.
	Standard angles		2001-08-05
		Nagaraj pose la question : Why 0o , 30o , 45o , 60o ,and 90o are taken as standard angles in Trigonometry? Why can't we take some other angles as standard angles? Chris Fisher lui répond.
	Linear regression		2001-08-01
		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 error-Sy.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		2001-07-11
		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.
	Sigma		2001-03-31
		A student pose la question : What does the Sigma symbol mean in mathematics? Penny Nom lui répond.
	A conic in standard form		2000-05-18
		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 16x2-9y2-160x-18y+247=0 Harley Weston 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.
	Estimating the population mean		1999-11-13
		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.
	Standard Deviation		1999-07-11
		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.
	Standard Form		1999-03-30
		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.
	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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