3. IfX1,X2, .... Xn are mutually independent normal random variables, with their means all equal to
問題詳情
3. IfX1,X2, .... Xn are mutually independent normal random variables, with their means all equal to 3 and variancesequal to 10, what is the variance of Y =
? (A)400 (B) 200 (C) 400n (D) 200n (E) None of the above choices (a)-(d).