The question is always, 95th percentile of what? I'm involved with a series of physics competitions, that winnows ~5 million high schoolers down to 5. - 10% of

The question is always, 95th percentile of what? I'm involved with a series of physics competitions, that winnows ~5 million high schoolers down to 5. - 10% of high schoolers learn calculus well in high school - 10% of those also learn calculus-based physics well in high school - 10% of those sign up for the first round competition - top 10% of those qualify for the second round - top 5% of those qualify for the final round - top 20% of those end up on the final five Which of these stages is supposed to be "easy"? Because the conjunction of all six certainly isn't.