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System/step9.md

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c9:统计各分数段的学生人数及所占的百分比

step1:输入每个学生的成绩 step2:判断输入成绩所在的分数段 step3:将各个分数段的成绩个数除以学生总人数并乘以百分百 step4:输出各个成绩段的百分比