129. 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
正选C
这里的median number是指的员工人数的中位数？答案我看的不是很明白，我想关键是我不知道哪个中位数是怎么算出来的吧
1
Although 25 percent of the projects have 4 or more employees, there is essentially no information about the middle values of the numbers of employees per project. For example, if there were a total of 100 projects, then the median could be 2 (75 projects that have exactly 2 employees each and 25 projects that have exactly 4 employees each) or the median could be 3 (75 projects that have exactly 3 employees each and 25 projects that have exactly 4 employees each); NOT suffi cient
求解释。谢谢作者: zxc1118zxc 时间: 2012-12-14 21:13
Median number, that the average number,
25% is 4 or above 4,
35% is below 2, that 1 or 2
so, the remaining 40% is 3, since 1-25%-35% is 40%
as a result, the median should be 3,
since the 25% above 4 is balanced with 25% of 1 or 2,
the remaining 10% of 1 or 2 is balanced with 10% of 3,
the remaining 30% is 3, that's where the median should be in.作者: norwaywinter 时间: 2012-12-15 06:57
