对每个班级，要输出一行学生成绩超出平均分的百分比，后面保留三位小数。
For each case you are to output a line giving the percentage of students whose grade is above average, rounded to 3 decimal places.
基于数字温度传感器ds18b20的测温仪设计，三位数码管显示温度值，保留小数点后一位。
Digital temperature sensor based on the thermometer DS18B20 design, the three digital display temperature, keep one decimal place.
基于数字温度传感器ds18b20的测温仪设计，三位数码管显示温度值，保留小数点后一位。
Digital temperature sensor based on the thermometer DS18B20 design, the three digital display temperature, keep one decimal place.
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