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army1987 comments on Is love a good idea? - Less Wrong
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I'm guessing that's from a base of 100? If so, you're off by almost a standard deviation there: the mean world IQ is very far from Western normed 100s. IIRC, the population weighted estimate from the Lynn national IQ estimates puts the global mean at maybe 90. That's going to affect the tails like 145+ a lot.
OTOH, a linear combination of Gaussians with a standard deviation of 15 and different means will not be a Gaussian and will have a standard deviation larger than 15. So a naive calculation as in trist's comment below will be an underestimate.