I remember seeing a gal on TV saying that different races have different average IQs. The examples she gave were Jewish people with averages in the 110s while black people had an average around 80. I don't remember what the other races were, but those were the extremes.
Before I debunk that, let me ask you this: Did you know it's possible to cram for an IQ test? It's true! You can't increase your IQ, but all tests will test your test-taking ability, as well as whatever they are testing for. It's the inherent nature of tests, and something I don't know how to fix.
Anyway, you get a few books of IQ tests, study them, then take the test. Boom. You score higher, even though your IQ is the same.
Think about the kinds of schools black kids and Jewish kids go to. Lots of black kids go to these inferior inner city schools, but lots of Jewish kids are going to private schools. I think the private schools are doing a better job of educating kids to take tests, so they are going to score higher on the IQ tests.
Let's suppose you corrected for these variables by bringing up a large portion of each race in the same school, teaching them similar things and so forth. There are such a wide variety of IQs in each race that these statistics are useless even if you found that there are different average IQs. There are going to be so many of each race that are above and below average that any attempt at profiling is simply a waste of time.
Screw that. Here's a way to check quickly: test the IQ's of Catholic schools. These are usually white kids, not in any way reflecting the demographics of any of these other groups. If their average IQ is around 110 it's because you are testing a population that sends its kids to private schools.