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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).
Standardized IQ tests are designed so that the exact average (mean) IQ score in the general population is 100. An â average IQ scoreâ or ânormal IQ scoreâ can be defined as a score between 85 and 115 â between plus and minus one standard deviation from the average.(See the table below).ith standardized IQ tests, IQ tests are designed so that their scores have a âbell curveâ distribution in the general population with an average of 100. This curve has a peak in the middle where most people score and tapering ends where only a few people score. In statistics this is called a normal distribution.