問題詳情
18. Suppose Y is a Poisson random variable with mean A - 4 and X is a Chi-square random variablewith degree of freedom df = 2. Which of the following statement is the most correct one?
(A) Covariance between X and Y is greater than 6；
(B)E[X +Y] = 4；
(C)Variance of X+ Yequals to 8；
(D)Covariance between 2X and 3Y is between -24 and 24；
(E)Variance of X + Y isbetween 8 and 16.
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