Let X be a random variable. Prove that Var(X) = min t E 4
Chapter , Problem 21(choose chapter or problem)
Let X be a random variable. Prove that Var(X) = min t E 4 (X t)2 5 . Hint: Let = E(X) and look at the expansion of E 4 (X t)25 = E 4 (X + t)25 .
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