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4. X = {0, 1, 2} and Y = {1, 1} are discrete random variables with P (X = 0, Y = 1) = P (X = 1, Y =
1) = P (X = 2, Y = 1) P (X = 0, Y = 1) = 0, P (X = 1, Y = 1) = 0.5, P (X = 2, Y = 1) = 0 (a) Write out
the discrete probability distribution table(b) Are X and Y independent?
(c) Compute the correlation of X and Y . (d) Does zero correlation guarantee independence?

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