这是道数学问题意思是说
分数或比数中大概有多少部分是在平均值（MEAN)的标差值（STANDARD DEVIATION)的范围内?因为我以前做的也是英文的中文的翻译可能有点没那么标准.
关于标准偏差的问题（英文）about what proportion of the scores are within
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