Question

How to calculate variance ?

Answer 1

variance of what

Answer 2

http://www.mathsisfun.com/data/standard-deviation.html

Answer 3

sample, population, random variable

Answer 4

I meant generally: I'd like to know if there's a formula

Answer 5

Variance is given by

\[\frac {\sum_{}^{}\left( x-xbar \right)^{2}}{n-1}\]

Answer 6

Okay

Answer 7

that is for the sample variance.