It seems to indicate at least that something is odd, doesn't it? You would expect statistically the same percentages in sports as in the whole of society.

I am just an outsider to this whole problem, not coming from the US. But some things I heard - like maybe for blacks the best shot at being admitted to college is the sports stipend? Just guessing... I seem to remember that there were so many black jazz and blues musicians because it was one of the few professions that was open to blacks (a bit similar to the jews all becoming money lenders, perhaps). So I don't know the actual causes, but if I was an outsider seeing this anomaly, I would at least investigate.