Question

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

Answer 1

-140.714286

Explanation:

The variance is calculated using the formula `1/N sum_(N=1)^N (x_i-mu)`, and when you sub in the numbers, you get the following values:
`mu=8`
`(-14-8)^2=(-22)^2=-484`
`(-9-8)^2=(-17)^2=-289`
`(-7-8)^2=(-15)^2=-225`
`(8-8)^2=0`
`(8-8)^2=0`
`(10-8)^2=(2)^2=4`
`(12-8)^2=(3)^2=9`

`(-484+(-289)+(-225)+0+0+4+9)/7= -140.714286`