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－0．9
解析 Cov(X，Y)＝ρXY＝－0．3×1×3＝－0．9
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考研数学三

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