有些学校在统计学生的学习成绩时,习惯统计某班某学科的算术平均分,并以此来权衡该班的学习情兄及教师的教学水平。这种统计的方法虽简便易行,得到公认,其实,它并不科学。 客观事物的数量关系,不仅要反映它的集中趋势,而且应该反映它的离中趋势。求算术平均数的方法;虽能反映样本的共性,却不能说明它的个性,它把各数据之间的差异掩盖起来了。因此,它不能真实 Some schools in the statistics of students’ academic performance, the customary statistics of a class an arithmetic mean score, and in order to weigh the class learning eldest brother and teachers teaching level. Although this method of statistics is simple and easy to understand, in fact, it is not scientific. The quantitative relationship of objective things should not only reflect its central tendency, but also reflect its trend of departure from the medium. The method of finding the arithmetic mean; although it can reflect the commonality of the sample, but can not explain its personality, it covers the differences between the data. So it can not be real