Suppose {X₁, X2,..., X1₁6} is a random sample coming from Gamma(a = 4, ß = 2) distribution. Consider the following statistic: Y = 3X − 5X₂+3X3 (a) Calculate E(Y). (b) Calculate the variance of Y, that is V(Y). Hint: Note that X and X; are not independent, hence your calculation will involve terms involving Cov(X, Y).