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标题: GWD-DS-Q36 [打印本页]

作者: 莉尚    时间: 2010-5-26 16:26     标题: GWD-DS-Q36

Q36:

What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

这是我的软肋,一直搞不清楚中数的性质。有的题目又有通过中数推断平均数的,希望大牛解答!
作者: myice    时间: 2010-5-26 16:55

25%大于等于4,35%小于等于2,说明40%的projects有3个employees。中数的概念是:将数字从小到大排列,若总数为奇数,则中数为中间那个数;若总数为偶数,则中数为中间两个数的平均值。此题因为40%的值为3,所以两个条件和在一起可以确定中数为3




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