这个你要去看NYT, 有篇报道专门把这些学校的很多数据都列上了的。

比方说UPENN：

The median family income of a student from Penn is $195,500, and 71% come from the top 20 percent. About 2.1% of students at Penn came from a poor family but became a rich adult.

What kind of students attend Penn

Among the lowest About typical Among the highest

		In the Ivy League	In Pennsylvania	Among Ivy Plus colleges
Median family income	$195,500
Average income percentile	82nd
Share of students from top 0.1%	3.6%
...from top 1%	19%
...from top 5%	45%
...from top 10%	58%
...from top 20%	71%
...from bottom 20%	3.3%

查起来比较费事，之前有个胡同学总结了个表，我没存。。。

https://www.nytimes.com/interactive/2017/01/18/upshot/some-colleges-have-more-students-from-the-top-1-percent-than-the-bottom-60.html