問題詳情
228. The number of tornadoes in a given year follows a Poisson distribution with mean 3.
Calculate the variance of the number of tornadoes in a year given that at least one tornado
occurs.
(A) 1.63
(B) 1.73
(C) 2.66
(D) 3.00
(E) 3.16
參考答案
答案:C
統計:A:0,B:0,C:0,D:0,E:0
難度:計算中