# Probability, show that

## Homework Statement

Consider two random variables X and Y. Suppose that Y takes on k values yi,....,yk and X takes l values xi,....,xl

Hey, I am supposed to show that
1) Pr(Y = yi = $$\sum$$,from 1 to l Pr(Y = yi(givrn)(X=xi)Pr(X=xi)

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

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