[求助]prep2-DS7

popris · 发表于 2009-3-29 17:43:00

What is the average height of the n people in a certain group?

1 The average height of the n/3 tallest people in the group is..., and the average height of the rest of the people in the group is...

2 The sum of the heights of the n people is...

为什么答案是A, 还不是很理解题目的意思,N个人在一组里的平均身高? 怎么算? 忘XDJM解答...

jmc0966 · 发表于 2009-3-29 19:19:00

<n/3 X A + (n-n/3) X B> / n

popris · 发表于 2009-3-29 20:12:00

o...是不是B的话是因为不知道整组的总和, 题目求的是整组高度和/n ...

恩..谢谢~~ ^-^

所属分类: GMAT考试