49. Let x be a real-valued random variable wit...

49. Let x be a real-valued random variable with E[X] and E[X2] denoting the mean values of X and X2, respectively. The relation which always holds true is

 

(B) E[X]2>(E[X])2

(A) (E[X])2>E[X2]

(C) E[X2]=(E[X])2

(D) E[X2]>(E[X])2

Hint: 

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