問題詳情
208. The lifetime of a machine part is exponentially distributed with a mean of five years.
Calculate the mean lifetime of the part, given that it survives less than ten years.
(A) 0.865
(B) 1.157
(C) 2.568
(D) 2.970
(E) 3.435
參考答案
答案:E
統計:A:0,B:0,C:0,D:0,E:0
難度:計算中