This question presupposes the legitimacy of "race" as a concept when there is a strong argument to be made that it is really just a social construct.
In any case, even if we presuppose the existence and the legitimacy of race as a concept, the evidence shows that average differences in IQ between nominally "black" and "white" races are of no real significance. Not only is there greater variation in intelligence WITHIN a racial group than between them, but average values tell us nothing about an INDIVIDUAL who may belong to one of those groups.