题目
设二维随机变量(X,Y)的分布律为[ ]Y 0 1 X 0 a 0.2 1 0.2 b_且P(Y=1mid X=0) =0.5,A. a=0.4,b=0.2B. a=0.2,b=0.4C. a=0.1,b=0.5D. a=0.5,b=0.1
设二维随机变量(X,Y)的分布律为[ ]Y 0\ \ 1\ \ X 0\ \ a 0.2\ \ 1\ \ 0.2\ \ b\_且P{Y=1\mid X=0}\ \ =0.5,
A. a=0.4,b=0.2
B. a=0.2,b=0.4
C. a=0.1,b=0.5
D. a=0.5,b=0.1
题目解答
答案
B. a=0.2,b=0.4