概率中关于期望E和方差X的选择题,给我解释一下为什么选或不选如果E(XY)=E(X)E(Y),则下列错误的是A、D(X-Y)=D(X)+D(Y)B、D(X+Y)=D(X)+D(Y)C、X与Y一定不相关D、X与Y一定相互独立我查了课本,如果X与Y
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 10:18:10
![概率中关于期望E和方差X的选择题,给我解释一下为什么选或不选如果E(XY)=E(X)E(Y),则下列错误的是A、D(X-Y)=D(X)+D(Y)B、D(X+Y)=D(X)+D(Y)C、X与Y一定不相关D、X与Y一定相互独立我查了课本,如果X与Y](/uploads/image/z/8393617-1-7.jpg?t=%E6%A6%82%E7%8E%87%E4%B8%AD%E5%85%B3%E4%BA%8E%E6%9C%9F%E6%9C%9BE%E5%92%8C%E6%96%B9%E5%B7%AEX%E7%9A%84%E9%80%89%E6%8B%A9%E9%A2%98%2C%E7%BB%99%E6%88%91%E8%A7%A3%E9%87%8A%E4%B8%80%E4%B8%8B%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89%E6%88%96%E4%B8%8D%E9%80%89%E5%A6%82%E6%9E%9CE%EF%BC%88XY%EF%BC%89%3DE%28X%29E%28Y%29%2C%E5%88%99%E4%B8%8B%E5%88%97%E9%94%99%E8%AF%AF%E7%9A%84%E6%98%AFA%E3%80%81D%28X-Y%29%3DD%28X%29%2BD%28Y%29B%E3%80%81D%28X%2BY%29%3DD%28X%29%2BD%28Y%29C%E3%80%81X%E4%B8%8EY%E4%B8%80%E5%AE%9A%E4%B8%8D%E7%9B%B8%E5%85%B3D%E3%80%81X%E4%B8%8EY%E4%B8%80%E5%AE%9A%E7%9B%B8%E4%BA%92%E7%8B%AC%E7%AB%8B%E6%88%91%E6%9F%A5%E4%BA%86%E8%AF%BE%E6%9C%AC%2C%E5%A6%82%E6%9E%9CX%E4%B8%8EY)
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