。 - 概率论与数理统计(经管类)(04183) - 专业知识收录平台"> 。 - 概率论与数理统计(经管类)(04183) - 专业知识收录平台">
X~U(1,3),E(XY)=1,Cov(X,Y)=-3,那么E(Y)=( )。
2
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