問題詳情
21. Let X be a strictly positive random variable, whose expectation equals to 0.5 and variance equalsto 1. Which of the following statement is the most correct one?
(A)Ein(2X)]＞0.5；
(B)Elin(2X)]sO；
(C)In(E[X])＞-0.2；
(D)In(E[X2])＜-0.3；
(E)2n(E[X])>-1.
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增