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A 4-sided die is rolled twice. Let X be the sum of the two rolls, Y be the first minus the second, and Z be

A 4-sided die is rolled twice. Let X be the sum of the two rolls, Y be the first minus the second, and Z be the 3 times the first, minus the second. (a) Compute Cov(X, Y): Cov(X, Y) = (b) Compute Cov(X, Z): Cov(X, Z) =

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