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。
以上就是GMAT数学基本概念解读:统计的详细内容,考生可针对文中介绍的方法进行有针对性的备考。最后预祝大家在GMAT考试中取得好成绩!
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