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数学的基本概念,如果考生加以归类,会感觉没有想象中那么复杂和混乱。考生可以根据归类的GMAT数学基本概念,加以复习和记忆。还要提醒考生的是,GMAT数学的基本概念,最忌讳的是死记硬背,考生最好采用理解式记忆法,GMAT数学基本概念就能轻松搞定。
通过上面对gmat数学基本概念中的统计概念的介绍,相信对于很多计划参加gmat考试的人来说,可以参考上述的信息来做好gmat数学考试的备考和准备工作。
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