4. Compute expected value E[X] and variance Var(X) of the following random variables. (a) X = sin(Y), where Y ~ Ber(p); (b) X ~ Pois(>); (c) X ~ Unif(a, b); (d) X = U2, where U ~ Unif(-2,5); (e) X ~ Exp(A); (f) X = ez, where Z ~ N(1, 02)