Posted by April on Sunday, January 24, 2010 at 7:37pm.
How do I find a variance for a set of numbers {1,16,8,17,12}
I got that variance34.2, but I'm unsure. Any help? Thanks.

math  Reiny, Sunday, January 24, 2010 at 8:16pm
look at his page.
http://davidmlane.com/hyperstat/A16252.html

Reiny  April, Sunday, January 24, 2010 at 8:25pm
I looked at that page and did my problem according to the example, but the answer I got wasn't even a choice. Can you help al ittle more please?

math  Reiny, Sunday, January 24, 2010 at 8:36pm
did you get a mean of 10.8 ?
My squared differences were:
96.04, 27.04,7.84,38.44,1.44
that sum/5 = 34.16 which is the variance^2
so the variance = √34.16 = 5.845
notice that there is difference in the calculation depending on whether you divide by N or N1.
Your text or your course should tell you which method to use.

math  April, Sunday, January 24, 2010 at 8:54pm
No. I thought mean was adding up the numbers and then dividing by how many numbers.
So .51+.44+.04+.01=1 divided by 4=.25

math  Reiny, Sunday, January 24, 2010 at 9:51pm
(1 + 16 + 8 + 17 + 12)/5 = 10.8
mmmmh?
where did you get your numbers from ????
Answer This Question
Related Questions
 reiny  How do I find a variance for a set of numbers {1,16,8,17,12} I got that ...
 Statistics  Which of these statements is not true about the variance in a ...
 math Variance  What does it mean when it says Variance of Stride Length with ...
 college math  20. Calculate the range, variance, and standard deviation of the ...
 HELPP math  13,14,29,26,41,53,60,7,89,14 Based on the numbers above what is the...
 Math  Two simple of sizes 8&10 are drawn from two normally distributed ...
 Add math  The mean of a set of numbers 1,y,1,2y+2,13 and 16 is 9. Find the ...
 maths  Q Two samples of sizes 8 and 10 are drawn from two normally distributed...
 statistics  Q Two samples of sizes 8 and 10 are drawn from two normally ...
 A  When actual cost is more than planned __________________. (Points : 1) A a ...
More Related Questions