Is this true? In all cases?
Nov 8, 2014 #2 WendyE 27 0 E(X) = expectation of X Let X = {-1, 0, 1} E(X) = (-1+0+1)/3 = 0 E|X| = ( |-1|+|0|+|1| )/3 = (1+0+1)/3 = 2/3 So, I think no, it's not true that E|X| = E(X) if I understand the question correctly.
E(X) = expectation of X Let X = {-1, 0, 1} E(X) = (-1+0+1)/3 = 0 E|X| = ( |-1|+|0|+|1| )/3 = (1+0+1)/3 = 2/3 So, I think no, it's not true that E|X| = E(X) if I understand the question correctly.