学生的成绩统计，求均值，求最大值，和求方差，并自动排序-Student achievement statistics, averaging, maximum demand, and demand variance, and automatic sorting

用于进行考试成绩的结果统计，包括均值、标准差、平均成绩、最高最低成绩等的统计分析。-Statistical results used for test scores, including mean, standard deviation, average score, highest score, such as the minimum statistical analysis.