2. 考研
  3. 设D(X)＝l，D(Y)＝9，ρXY＝0＝3．则Cov(X，Y)＝________．

设D(X)＝l，D(Y)＝9，ρXY＝0＝3．则Cov(X，Y)＝________．

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

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