I taught university (big state school) about 10 years ago and it was department policy to flunk >= 40% of each calculus class. We curved to accomplish this and every class was told this was the policy on day 1. We got a mix of students at my school and this was to keep the dopes from designing airplanes and such. I personally would have been happier letting engineering do their own dirty work, but that was math's job and I like my plane flights to be uneventful, so yeah.