求解释PREP上的题

ad蓝颜 · 发表于 2010-9-3 22:42:51

Amy's grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 were higer than Amy’s, and the rest were lower. If no other grade was the same as Amy’s grade, then Amy's grade was what percentile of the grades of the two classes combined?

A:72nd B:80th C:81st D: 85th E: 92nd

alexandrahs · 发表于 2010-9-4 00:49:09

我也是今天做到这道题不懂也求NN指教！！！感激不尽

ad蓝颜 · 发表于 2010-9-4 22:01:04

一样一样，，还是不懂

fullmoon558 · 发表于 2010-9-4 22:18:11

我算怎么是20%啊

tuobafeiyang · 发表于 2010-9-4 22:26:31

这题D？

alexandrahs · 发表于 2010-9-4 23:35:39

呜呜呜，还没有NN出现吗？拜托高手快来搭救！！！！！！

Silan · 发表于 2010-9-4 23:52:53

选E么？

alexandrahs · 发表于 2010-9-5 00:38:54

答案是 85th

fullmoon558 · 发表于 2010-9-5 20:27:12

懂了。Amy's grade is 90th percentile, meaning that she outperformed 90% of her classmates. so (72+81)/180=0.85

antony880805 · 发表于 2010-9-6 14:03:11

ls正解

求解释PREP上的题

所属分类: GMAT考试

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