EDIT: the post that this was a response to was deleted, so it probably makes no sense now on this thread. i'm leaving it up for the rare chance that it might help someone on this board.
that's not true. he was talking about being ranked in the top 40% at schools in the t20 (USC and UCLA), t14 (cornell) and t10 (michigan).
it is still very possible to get a biglaw job at a t20 school if you finish in the top 50% of your class (though top third would be more of a guarantee). it's probably a little easier than that at cornell, and much easier at michigan. you only need to be top 10-15% and on LR for biglaw if you're at a school in low tier 1 or below.
and as far as YHS, i would venture to guess that at least 80% (maybe 90%) of the class could land biglaw jobs. in fact yale doesn't even have grades so it's probably more like 100%.