2. 考研
  3. 设D(X)＝1，D(Y)＝9，ρXY＝－0．3，则COV(X，Y)＝________．

设D(X)＝1，D(Y)＝9，ρXY＝－0．3，则COV(X，Y)＝________．

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问题 设D(X)＝1，D(Y)＝9，ρXY＝－0．3，则COV(X，Y)＝________．
选项
答案Cov(X，Y)＝ρXY[*]＝－0．3×1×3＝－0．9．
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考研数学一

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