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9. (10 points) (i) For bivariate discrete r.v.'s (X, Y), show that Var (W) = abox+bor + 2aboxy based on E [W] = aux +

9. (10 points) (i) For bivariate discrete r.v.'s (X, Y), show that Var (W) = abox+bor + 2aboxy based on E [W] = aux + buy, where W = ax + by

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