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4. (a) Show that E{X E(X)} = 0 for any random variable X. (b) Use the result in part (a) and Eq. (A.31) to Show

4. (a) Show that E{X E(X)} = 0 for any random variable X. (b) Use the result in part (a) and Eq. (A.31) to Show that if two random variables are independent then they are uncorrelated

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