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US IQ standard Deviation is 16.
deviation 15 is better
About 98% of the population.
The average IQ for any age is 100. A slight deviation either way (95-105) is accepted as normal. Higher is "better".
It depends on the standard deviation. IQ 138 sd 116: 1/114; IQ 138 sd 115: 1/177Have a look at this: http://www.iqcomparisonsite.com/IQtable.aspxBest wishesChristoph