The variance of a group of data S2 = [(x1-2) 2 + (x2-2) 2 +...] +(x10-2) 2], then the average of this set of data is_______ .
The average is two
The definition of variance is the sum of the difference between each number and the mean
The average is two
The definition of variance is the sum of the difference between each number and the mean