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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 for an adult is anywhere from 90 to 115. Just to give some figures the average IQ for one that has a mental disibility ranges from 30 to 50 and the IQ for one tâ¦hat is a genius is 140 and higher. You can find complete information about IQ by going on best-iq-test (dot) com and then click on IQ.