We've probably all heard by now that the average IQ for black Americans is 15 points lower than the average for white Americans. It seems to be as factually established as anything else we know.
So what does that mean, exactly?
It means that if you are as smart as the average white American, there are six million black Americans smarter than you.
(Hat tip to John Derbyshire. Horrible mathematical details to be demonstrated by me at a time of MY choosing--though I might get 5 million or 7 million.)