变异系数是指（）。 -题库考试答案搜索网

变异系数是指（）。

单选题

2021-09-01 16:38

A、随机事件的各种变量与相应概率的加权平均值
B、随机变量取值与数学期望离差的平方和的平方根
C、随机变量标准差与数学期望的比值
D、随机变量的标准差的平方与数学期望的比值

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正确答案

C

试题解析

标签：西安交通大学项目评估学习指南

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在哪种情况下比较资料的变异程度要用变异系数（）。

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