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描述统计手册 / 集中趋势的度量 / 调和平均
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来自维基教科书，一个开放世界的开放书本
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描述统计手册
当数据以速度（例如千米/小时）、速率（例如千克/卢比）等形式给出时，通常最喜欢调和平均。调和平均被定义为给定序列中各项的倒数的倒数的算术平均。
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书籍：描述统计手册
华夏公益教科书
