GRE数学的15条基本概念
1、mode
一堆数中出现频率最高的一个或几个数
e.g. mode of 1,1,1,2,3,0,0,0,5 is 1 and 0
2、range
一堆数中最大和最小数之差
e.g. range of 1,1,2,3,5 is 5-1=4
3、mean
arithmatic mean
geometric mean n个数之积的n次方根
4、median
将一堆数排序之后,正中间的一个数,
或者中间两个数的平均数
e.g. median of 1,7,4,9,2,2,2,2,2,5,8 is 2
median of 1,7,4,9,2,5 is /2=6
5、standard error
一堆数中,每个数与平均数的差的绝对值之和,除以这堆数的个数
e.g. standard error of 0,2,5,7,6 is:
/5=2.4...
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