设E(X)=E(Y)=2,cov(X,Y)=－1/6,则E(XY)=
A.－1/6
B.23/6
C.4
D.25/6
人气：218 ℃ 时间：2020-04-05 13:56:11
解答
B
推荐
- COV(X,Y)=E(XY)-E(X)E(Y)怎么出来的
- 协方差中Cov(X,Y)=E(XY)-E(X)E(Y),这里的E(XY）怎样计算,举个例子呗
- Q1:协方差公式Cov(X,Y)=E(((X-E(X))(Y-E(Y)))即Cov(X,Y)=E(XY)-E(X)E(Y)中 E（XY）怎么求啊?
- 协方差中Cov(X,Y)=E(XY)-E(X)E(Y),这里的E(XY）怎样计算,举个例．
- 设(X,Y)为二维随机变量,证明:COV(X,Y)=E(XY)-EXEY
- 在高速公路上骑扎车行道分界线的什么意思
- which stands in...= which lies in… = which is located in… = which is situated in
- 钢材的材质中：Q235、Q235B、Q335B、Q345B是什么意思?
猜你喜欢
