Applied statistics

9. Suppose X1, X2, ..., Xn are independent N(u, 02) random variables. Let Y = X1+ X2+ ...+ Xn 2n Which of the following describes the random variable Y. ( a ) N HO ( b ) NM, 2 (c) N 2: 2n (d) N 5, (e) N ( M, An 10. Suppose X is a random variable with probability density function 3 p(2) = 2 2x2 if 1