second mean-value theorem

例句：

1. 1. The mean-value theorem is a fundamental principle in statistics.
   均值定理是统计学中的一个基本原理。
2. 2.In the mean-value theorem, the average of a set of numbers is found by taking the arithmetic mean of each number in the set.
   在均值定理中，一组数的平均值是通过计算集合中每个数的算术平均值来找到的。
3. 3. The mean-value theorem is used to determine the expected value of a random variable.
   均值定理用于确定随机变量的期望值。