题目
X and Y are discrete random variables with the following joint distribution; Pr (X = 4,Y = 30) = 0.07.「huixue_img/importSubject/1564169386363850752.png」What is the conditional standard deviation of Y given X=7?
选项
A.10.3
B.14.7
C.21.2
D.29.4
答案
A
解析
「huixue_img/importSubject/1564169386401599488.png」