a Let X and Y be two independent random variables. Y has a binomial distribution with 5 trials and probability of success p0.5 and X has a Poisson distribution with 1-2 Let WeX+Y and Z-x2y a)-(2 points) Find the expected value and variance of X. b)-(2 points) Find the expected value and variance of Y. c)-(2 points) Find the expected value of W. d)-(2 points) Find the variance of W. e)- (2 points) Find the covariance of Z and W.