选择题:能全面反映总体各单位标志值变异程度的指标有A、平均数B、全距C、平均差D、标准差E、标准差系数

题目内容:
能全面反映总体各单位标志值变异程度的指标有
A、平均数
B、全距
C、平均差
D、标准差
E、标准差系数
参考答案:

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