Show that Cov(X, Y) = E(XY) - E(X)E(Y), and use this
Chapter 6, Problem 6.4.38(choose chapter or problem)
Show that Cov(X, Y) = E(XY) - E(X)E(Y), and use this result to conclude that Cov(X, Y) = 0 if X and Y are independent random variables.
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