GMAT数学基础知识介绍：统计_GMAT数学

　　Ⅱ.74,74,74,74,74

　　Ⅲ.62,74,74,74,89

　　The data sets Ⅰ,Ⅱ,and Ⅲ above are ordered from greatest standard deviation to least standard deviation in

　　which of the following ?

　　 Ⅰ,Ⅱ, Ⅲ Ⅰ, Ⅲ,Ⅱ Ⅱ, Ⅲ, Ⅰ Ⅲ, Ⅰ,Ⅱ Ⅲ,Ⅱ, Ⅰ

　　【解析】标准差相当于数组的偏差程度，偏差程度越大则标准差越大。正确答案为 E。

　　8. range 范围

　　最大数减去最小数所得的差就是该组数据的范围。

　　例 1：150, 200, 250, n

　　Which of the following could be the median of the 4 integers listed above?

　　Ⅰ. 175Ⅱ. 215Ⅲ. 235

　　 Ⅰonly Ⅱonly Ⅰand Ⅱonly Ⅱand Ⅲ only Ⅰ,Ⅱ,and Ⅲ

　　【解析】由题可知，n 位于数字排序最右边时，取得最大的中位数=225，因此整个数字排序的中位数必

　　然小于等于 225，只有 I 和 II 符合要求。正确答案为 C。

　　例 2：The least and greatest numbers in a list of 7 real numbers are 2 and 20, respectively. The median of the

　　list is 6, and the number 3 occurs most often in the list. Which of the following could be the average of the

　　numbers in the list?

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