Question: 4.49 Prove that (a) 2 = E(X2) 2; (b) 3 = 3 3 2 + 23.

4.49 Prove that

(a) σ2 = E(X2) − μ2;

(b) μ3 = μ 3 − 3μ 2 · μ + 2μ3.

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