Let X and Y be independent normal random variables. Suppose that E(X) = 1, E(Y ) = 2, V (X) = 3, V (Y ) = 4.

(1) Compute E(X²).
(2) Compute P (X ≥ Y ).
(3) Let U = X +Y, W = 2X −Y. Find E(U), E(W), V(U), V(W), and Cov(U,W).
(4) Compute the conditional distribution of U given that W = 4.