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一道GMAT数学题!Thearithmeticmeanofadatasetis46andthestandarddeviationofthesetis4.Whichvalueisexactly1.5standarddeviationsfromthearithmeticmeanoftheset?

题目详情
一道GMAT数学题!
The arithmetic mean of a data set is 46 and the standard deviation of the set is 4.
Which value is exactly 1.5 standard deviations from the arithmetic mean of the set?
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答案和解析
算术平均的数据集是46,设置的标准偏差是4.
  值是1.5标准差的算术平均?