問題詳情
232. The number of claims X on a health insurance policy is a random variable with
E[X2]=61 and E[X-1]2=47.
Calculate the standard deviation of the number of claims.
(A) 2.18
(B) 2.40
(C) 7.31
(D) 7.50
(E) 7.81
參考答案
答案:A
統計:A:0,B:0,C:0,D:0,E:0
難度:計算中