We have two formulas for computing the variance of X, namely, var(X) = E[X E(X)]2 and
Chapter 12, Problem 31(choose chapter or problem)
We have two formulas for computing the variance of X, namely, var(X) = E[X E(X)]2 and var(X) = E(X2) [E(X)]2 (a) Explain why var(X) 0. (b) Use your results in (a) to explain why E(X2) [E(X)]2
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