[JohnnyHumongous]

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10 points is a standard deviation. so an IQ of 130 is already in the top 1%.

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I think the SD in a typical IQ test is 15 or 16. My IQ is in the low 160s, and I'm pretty sure I'm around sigma 4.

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that may have changed with the time. initially, meaning when they were first created, they were setup to have a mean of 100 and SD of 10, for the obvious reason of making it very easy to do calculations. i noticed most 'test yourself' or online iq test have much much wider SD which i think is only natural because they are being marketed to the masses and you much rather sell them a test that will give them a big number than a low one.

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I believe that when it was first created it was calculated as your mental age divided by your actual age, then multiplied by 100... so a 10 year old with an IQ of 120 would have the intelligence of an average 12 year old.

Also I believe it was primarily intended to measure intelligence in those under 16. Supposedly it's not even really a good measure of intelligence for those older than their teen years.