問題詳情
252. The independent random variables X and Y have the same mean. The coefficients of variation of X and Y are 3 and 4 respectively.
Calculate the coefficient of variation of
(A) 5/4
(B) 7/4
(C) 5/2
(D) 7/2
(E) 7
參考答案
答案：C
統計：A:0,B:1,C:0,D:0,E:0
難度：計算中