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Given below is the joint probability mass (PMF) function of X and Y : X 2 W 0 0.20 0.20 V 2 0.10 0 0.20 3 0.10 0.20 0 Determine (a) E(X ) , E(X ') and VAR(X) (b) E(Y ), E(Y ') and VAR(Y) (c) E(XY ) and COV(XY)