以下表格显示了两个班级的学生数学考试的平均分
学生数量 平均分
A班 38 72
B班 42 54
A班一个91分的人被记录成了19分,算在了A班的平均分里.算出正确的两个班的总平均分.
38*72+(91-19)=2736+72=2808
2808+42*54=5076
5076/(38+42)=63.45
平均分就是mean number =63.45
The table shows the mean marks of two classes of students in
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