問題詳情

If X1. X2, ....

are mutually independent norma! random variables, with their means all equal to 3 and variances equal to 10, what is the variance of

?
(A) 400
(D) 200m 
(B) 200
(C) 400m
(E) None ofthe above choices (a)-(d).

參考答案

答案：E
難度：計算中-1
書單：沒有書單，新增