Q. 95.0( 2 Votes )

Let X be a discre A. E(X2)

B.E(X2) + (E(X))2

C. E(X2) – (E(X))2

D.

Answer :

Let X be a random variable whose possible values


Possibilities p(x1), p(x2),…………p(xn)respectively.


Let = E (X) be the mean of X. The variance of X, denoted by Var (X) or defined as









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