CUCET PGQP 25

[HARISH RAJPUT]

IF X is normally distributed with mean zero and unit variance , then variance of X^2 is
a) 1  b) 2  c) 3 d) 4

[hariom arora]

Ans is 2
E(x^4)-{E(x^2)}^2=var(x^2)
3 sigma^2-sigma^2=2sigma^2
Sigma=1 hence ans is 2