Question

The algebraic sum of the deviations of a set of n values from their mean is

(a) 0

(b) n − 1

(c) n

(d) n + 1

Answer 1

Ifbe the mean of the n observations, then we have

Letbe the mean of n values. So, we have

The sum of the deviations of n valuesfrom their meanis

Hence the correct choice is (a).