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.
GMAT数学是GMAT考试的重要组成,GMAT数学概念是最基本的构成元素,我们通过学习GMAT数学概念,了解GMAT数学的最基本的出题规则,从而取得GMAT数学部分的了解熟悉。
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