Question

If the variance of the four numbers a,b,c and d is 9, then the variance of the four numbers 14-a, 14-b, 14-c and 14-d is _?
A. 5
B. 9
C. 23
D. 121

Answer 1

since the variance is a measure of the absolute differences from the mean, shifting the mean by 14 and flipping the difference does not affect the variance.

(B)