問題詳情

253. Points scored by a game participant can be modeled by Z = 3X + 2Y – 5. X and Y are independent random variables with Var (X) = 3 and Var (Y) = 4.

Calculate Var (Z).
(A) 12
(B) 17
(C) 38
(D) 43
(E) 68

參考答案

答案:D

統計:A:1,B:0,C:0,D:0,E:0

難度:計算中