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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 IQ level of a person with normal intelligence is defined in the range of 100 to 150, and usually a common man doesn't fall below the score of 50 or above 150. Here is the overview of IQ ranges of humans, with the highest IQ ever recorded.he IQ level of a person with normal intelligence is defined in the range of 100 to 150, and usually a common man doesn't fall below the score of 50 or above 150. Here is the overview of IQ ranges of humans, with the highest IQ ever recorded.