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3. Let X, Y be two random variables, what are the definition of the following concepts? a. E(X) b. V(X) c. Cov(X,Y) d. Cor(X,Y)

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3. Let X, Y be two random variables, what are the definition of the following concepts? a. E(X) b. V(X) c. Cov(X,Y) d. Cor(X,Y)

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