设x与y为任意二个随机变量,若已知cov(XY)=0,则必有A . D ( XY ) = D ( X

设x与y为任意二个随机变量,若已知cov(XY)=0,则必有A . D ( XY ) = D ( X ) D ( Y ) B、X与Y相互独立C . E ( XY

查看答案