为什么在计算平均指标的基础上还有必要进一步计算变异指标？

【参考答案】

在计算平均指标的基础上，进一步计算变异指标是必要的，因为变异指标能够反映一组数据的离散程度，即数据分布的波动性或分散性。......

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单项选择题

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
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The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
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A cumulative frequency distribution would provide（）.

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