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It compares people of the same age or age category and assumes that IQ is normally distributed, that the average (mean) is 100 and that the standard deviation is something like 15 (IQ tests sometimes differ in their standard deviations).
An IQ in the 90 to 109 range is an average IQ which is what at least 50 percent of the worldâs population falls into. You have the ability to learn as well as most of the rest of the population and the ability to create a good standard of living.