内容：

（1）定义一个学生档案类，包括学生姓名，性别，成绩等

（2）使用类方法统计所有学生总人数，以及课程总成绩及平均分

要求：　　

（1）学生人数不少于10人

（2）课程不少于3门

（3）能显示运行结果

-Content:

(1) defines a student file types, including student name, gender, performance

(2) the use of class methods statistics the total number of students, as well as the course grade and the average

Requirements:

(1) at least 10 the number of students

(2) course of at least three

(3) shows the operating results