求大神们帮我看一下这道GRE数学题,没读明白
Alistofnumbershasameanof8andastandarddeviationof2.5.Ifxisanumberinthelistthatis2stand...
A list of numbers has a mean of 8 and a standard deviation of 2.5. If x is a number in the list that is 2 standard deviation above the mean, what is the value of x? 单词没问题但题没看懂,大神们帮帮我
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