The joint pmf of two discrete random variables, X and Y, is given in the following table: x 1 3 4 .02 .02 .05 .02 3 .02 .05 .20 .04 4 .02 .02 .04.10 (a) Find the marginal pmfs of X and Y. (b) Find the conditional pmf of X given Y = 1. y 1 2 .05 2.05 .20 .10

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