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)＝______．

admin2018-01-23  48
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
转载请注明原文地址:https://www.kaotiyun.com/show/T5X4777K
0

考研数学三

相关试题推荐
随机试题
最新回复(0)