名词
中文翻译：总体平均数
同义词：
['average', 'mean', 'average value']
例句：
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1.The overall mean of the data is calculated to find out the overall trend.
数据的总体均值被计算出来以发现总体趋势。
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2.The overall mean of the students' scores was higher than last year's.
学生的平均分比去年高。
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3. The overall mean of the population is used to calculate the average age.
总人口的平均年龄用于计算平均年龄。