Suppose that X is a random variable such that E(X2) is
Chapter 4, Problem 4(choose chapter or problem)
Suppose that X is a random variable such that E(X2) is finite. (a) Show that E(X2) [E(X)] 2. (b) Show that E(X2) = [E(X)] 2 if and only if there exists a constant c such that Pr(X = c) = 1. Hint: Var(X) 0.
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