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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.n IQ of 115 or more can be considered to be a high IQ score or level. Only 15% of the population have an IQ level of 115 or above. There is no magic bullet but in general it is thought that: 1  An IQ of 110 or above enables you to attain a college level education if you choose it.