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## Homework Statement

Consider two random variables X and Y. Suppose that Y takes on k values y

_{i},....,y

_{k}and X takes l values x

_{i},....,x

_{l}

Hey, I am supposed to show that

1) Pr(Y = y

_{i}= [tex]\sum[/tex],from 1 to l Pr(Y = y

_{i}(givrn)(X=x

_{i})Pr(X=x

_{i})

and

2) E(Y) = E(E(Y(given)X)

I am not sure where to start on neither of them,