“平均数”是“统计与概率”领域的一个重要内容,教材通过“移多补少”和“求和平均分”的方法,引导学生计算出一组数据的平均数。教材中的第1道练习题是这样的:“移多补少”的动态过程,有助于学生直观地理解平均数的本质意义。而“求和平均分”则是在“移多补少”的基础上抽象出的一种简洁的、具有普遍意义的方法。两者是有内在联系的,在具体运用中,可以根据数据的特点而灵活选择合适的方法。笔者在教学 “Average ” is an important part in the field of “Statistics and Probability ”. The textbook guides the students to calculate a set of data by means of “shift less” and “summing average” Average. The first exercise in the textbook is like this: “Move more and make less ” dynamic process helps students to intuitively understand the meaning of the average. However, the summation of the sum of points is a simple and universal method abstracted from the principle of multiplying less. The two are intrinsically linked, in the specific use, according to the characteristics of the data and the flexibility to choose the appropriate method. The author is teaching