Let {X;} be a random sample of size n = 5 such that E(X) = 5 and V(X;) = 9. a) (3pts) What is the expected value E(X) of the sample mean X = }}_X;? b) (3pts) What is the variance V(X) of the sample mean X? c) (4pts) If I construct a random variable U = i=1(X; X), what is its expected value E(U)? -