answer all questions with explanation

10. 2p (a) The random variables X1, ...; X's have a joint multinomial distribution with parameters n = 320 and p; = 0.18, 0.44, 0.17, 0.04, 0.17, i = 1, ...,5. Find Cov(X1, X4). (A) -2.300 (B) -2.302 (C) -2.304 (D) -2.306 (E) -2.308 (b) The random variables X1, ..., X's have a joint multinomial distribution with parameters n = 230 and p; = 0.33, 0.06, 0.37, 0.15, 0.09, i = 1, . .., 5. Find Cov(X2, X4). (A) -2.070 (B) -2.072 (C) -2.074 (D) -2.076 (E) -2.078