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1. Suppose U; V; W are independent Poisson random variables with means ?; µ; r,, respectively. Let W; Y W:

(a) Find the marginal pmfs of and Y.

(b) Find the joint pmf of .X; Y /.

2. Suppose a fair die is rolled twice. Let and be the two rolls. Find the following with as little calculation as possible:

(a) E.X jy/.

(b) E.XY jy/.

(c) Var.X 2jy/.

(d) pX CY;X -Y :

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