That's flat out misrepresenting the data to support your agenda. Women in general fit more on the average of IQ, while they bell curve off the minority being on the higher and lower end of IQ. Men are the opposite, generally the majority are on the higher and lower end and the minority are average.
When it comes to racial IQ, it becomes a big problem. Because it's easy to pick out who is black, white, asian, hispanic, etc just by looking at somebody. But that's hardly scientific. And when you want to measure something like IQ by race accurately, you need to define race accurately. And from what little I understand of genetics, when you get down to that level, it's not as simple as saying this set of genes = this race. It's far more complex than that.
That said. IQ is genetic. And if you're going to be sampling a bunch of black people across America, you're likely to get a result of black people with overall average less IQ, because America has a culture, especially in black communities, to cherish stupidity, that intelligence is a 'white' thing and that's bad.
You've got idiots fucking idiots and making idiot kids. All their culture needs is to embrace intellectualism and stop trying to distance themselves from it as if it's a 'white' thing and it can't be a black thing too.