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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).
The average IQ is 100. Most IQ tests are constructed so that there are no overall score differences between females and males. An intelligence quotient, or IQ, is a score derived from one of several standardized tests designed to assess human intelligence.