law of the mean

例句：

1. 1. The law of the mean states that in a group of people, the average is the best representation of their collective abilities.
   中庸之道表明，在一组人中，平均值最能代表他们的集体能力。
2. 2. The law of the mean has been used to guide decision-making in many fields, including economics andpolitics.
   中庸之道已被广泛应用于许多领域，包括经济学和政治学中的决策制定。
3. 3.In the field of statistics, the law of the mean is often used to calculate the average value of a set of data.
   在统计学领域，中庸之道常被用来计算一组数据的平均值。