素质教育是一种使全体学生在全面发展的基础上获得个性发展的教育，其实质是差异教育，所以，素质教育实施的关键乃是在于实施适应个体差异的教学。从量的方面来分析便可发现，一般情况下班级中所有学生的分数（在能力测验中所得的分数）大体上有以下几种分布：常态分布，即多 Quality education is a kind of education that enables all students to acquire individual development on the basis of comprehensive development. Its essence is difference education. Therefore, the key to implementing quality education lies in the implementation of teaching that adapts to individual differences. From the quantitative analysis, it can be found that in general the scores of all students in the class (the scores obtained in the proficiency test) generally have the following distribution: normal distribution, ie