为了方便广大考生更好的复习,综合整理了GMAT数学概念和名词汇总,愿大家都能取得好成绩。
quartile就是小于median的所有数的median, hehe就是将所有的统计标本按顺序排列,再从头到尾分为个数相同的4堆quartile就是第一堆的最后一个,或是第二堆的第一个题目中,50个数,一定知道median是第25个或第26个同样,quartile是第12或是13个,the third quartile当然是37或是38个至于到底是37还是38,GRE不会为难你的,这两个数肯定一样
对Quartile的说明:Quartile(四分位数):
第0个Quartile实际为通常所说的最小值(MINimum)
第1个Quartile(En:1st Quartile)
第2个Quartile实际为通常所说的中分位数(中数、二分位分、中位数:Median)
第3个Quartile(En:3rd Quartile)
第4个Quartile实际为通常所说的最大值(MAXimum)
我想大家除了对1st、3rd Quartile不了解外,对其他几个统计量的求法都是比较熟悉的了,而求1st、3rd是比较麻烦的,下面以求1rd为例:
设样本数为n(即共有n个数),可以按下列步骤求1st Quartile:
(1)将n个数从小到大排列,求/4,设商为i,余数为j
(2)则可求得1st Quartile为:/4+j/4
例(已经排过序啦!):
1.设序列为{5},只有一个样本则:/4 商0,余数0
1st=第1个数4/4+第2个数0/4=5
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