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The bell curve has both the mean and the deviation, you can have a 'race' with lower mean and larger standard deviation, and then you can e.g. filter by reliable accomplishment of some kind, such as solving some problem that smartest people in the world attempted and failed, you may end up with situation that the population with lower mean and larger standard deviation will have fewer people whom attain this, but those whom do, are on average smarter. Set bar even higher, and the population with lower mean and larger standard deviation has more people attaining it. Also, the Gaussian distribution can stop being good approximation very far away from the mean.
edit: and to reply to grand grand parents: I bet i can divide the world into category that includes you, and a category that does not include you, in such a way that the category including you has substantially higher crime rate, or is otherwise bad. Actually if you are from US, I have a pretty natural 'cultural' category where your murder rate is about 5..10x of normal for such average income. Other category is the 'racists', i.e. the people whom use skin colour as evidence. Those people also have substantially bad behaviour. You of course want to use skin colour as evidence, and don't want me to use your qualities as evidence. See if I care. If you want to use the skin colour as evidence, lumping together everyone that's black, I want to use 'use of skin colour as evidence', lumping you together with all the nasty racists.
IIRC, no substantial difference was found in the standard deviations among races. (Whereas for genders, they have the same mean but males have larger sigma, so there are both more male idiots than female idiots and more male geniuses than female geniuses.)
Isn't IQ defined to be a Gaussian (e.g. IQ 160 just means ‘99.99683rd percentile among... (read more)