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Average IQ is set to be 100 exactly, with standard deviation of 15 I think. So 85-115 covers about 70% of the population (assuming my memory of stats still serves!)
Most IQ tests are only valid over a small range, however. If your IQ is 160 and you take a 'standard' test you'll probably only score about 140 (as the 'standard' tests can only discriminate in the middle zone). There are, I believe, special tests for the extremes of the range - both low and high.
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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