What is the variance of {-7, 8, -9, 10, 12, -14, 8}?

1 Answer
Mar 14, 2016

-140.714286

Explanation:

The variance is calculated using the formula 1NNN=1(xiμ), and when you sub in the numbers, you get the following values:
μ=8
(148)2=(22)2=484
(98)2=(17)2=289
(78)2=(15)2=225
(88)2=0
(88)2=0
(108)2=(2)2=4
(128)2=(3)2=9

484+(289)+(225)+0+0+4+97=140.714286