find the arithmetic mean ;
find the differences between the mean and each of the n numbers ;
square each of the differences ;
find the average of the squared differences ;
take the nonnegative square root of this average.
Notice that the standard deviation depends on every data value, although it depends most on values that are farthest from the mean. This is why a distribution with data grouped closely around the mean will have a smaller standard deviation than data spread far from the mean.
以上就是小编整理的GMAT考试数学部分常见的几个概念,GMAT数学对于考生的基础知识要求是比较高的。所以考生们在复习的时候要多多注意,GMAT入门的考生复习数学先从背诵基础知识开始做起吧。
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