Either I'm misunderstanding the math, or you are. An IQ of 180 is 5 1/3 SD above mean, which is a bit more frequent than 1 in 26,330,254 (which would be 5.5 SD)

Either I'm misunderstanding the math, or you are. An IQ of 180 is 5 1/3 SD above mean, which is a bit more frequent than 1 in 26,330,254 (which would be 5.5 SD). Half that common because we're only talking about above, and 1 in 50m people on earth is still 160 people. That's not many, but I don't think it's negligible either. https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule#Table_of_numerical_values https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rul...