• 2022-06-17
    设(X,Y)的联合分布律如下表所示,[img=286x79]1802ddf7264b799.jpg[/img] 则以下结果正确的是
    A: E(XY)=E(X)E(Y)
    B: D(2X-Y)=4D(X)+D(Y)
    C: Cov(X,Y)<0
    D: [img=127x27]1802ddf72f0f3d3.png[/img]
    E: D(X-Y)=D(X)-D(Y)
    F: D(XY)=D(X)D(Y)