Question

设二维随机变量(X，Y)的联合分布函数为F(x，y)，其边缘分布函数为FX(x)及FY(y)，则P{X＞x，Y≤y}=( )

A.FY(y)－F(x，y)
B.FX(x)－F(x，y)
C.F(x，y)－FX(x)FY(y)
D.1－FX(x)FY(y)

Answer 1

【答案】：A
令A={X≤x}，B={Y≤y}，则P{X＞x，Y≤y}=P=P(B)=P(AB)=FY(y)=F(x，y)，应选(A)