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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).
Best Answer: The average IQ is by definition 100. Scores above 100 indicate a higher than average IQ and scores below 100 indicate a lower that average IQ. The range from 85 to 115 is considered low average to high average. Theoretically, scores can range any amount below or above 100, but in practice they do not meaningfully go much below 50 or above 150.