問題詳情
246. Let X be the annual number of hurricanes hitting Florida, and let Y be the annual number of hurricanes hitting Texas. X and Y are independent Poisson variables with respective means 1.70 and 2.30.
Calculate Var(X−Y| X+Y=3).
(A) 1.71
(B) 1.77
(C) 2.93
(D) 3.14
(E) 4.00
參考答案
答案:C
統計:A:0,B:0,C:0,D:0,E:0
難度:計算中