I would say that expectation is destiny. There are blacks who excel....you only have to look as far as Jeopardy last year, when black men won both the Tournament of Champions and Teenage Jeopardy.
Even though average IQ socres are lower for some ethnic and racial groups than they are for others, that in no way means they should be held to lower standards. A certain percentage of minority students will excel if expected to do so.
not that there aren't really smart black people because there's a ton, a lot smarter than me for sure...