Question: Problem 3.21 The random variable X has pf defined by: f(x) = 1 5 ; x = 1, 2, 3, 4, 5; f(x)=0 elsewhere. Compute:

Problem 3.21 The random variable X has pf defined by: f(x) = 1 5 ; x = 1, 2, 3, 4, 5; f(x)=0 elsewhere. Compute:

(a) E(X)

(b) E(X2)

(c) V (X)

(d) E(2X)

(e) E( √ X)

(f) E(2X + 5) (g) V (2X + 5)

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