At Yale, 62% of grades are A or A-.
http://www.yalealumnimagazine.com/articles/3735
We all know that grade inflation is an issue at a lot of elite schools (yawwwwwn!), but I wonder why this thread was started in this forum, and not at some other?
Oh wait, it has!!!
http://talk.collegeconfidential.com/university-pennsylvania/1732466-gpas-at-penn-vs-brown.html
(Kudos to the Penn forum folks, who as of this writing have completely refrained from responding to the thread. But who knows, maybe it will heat up there)