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Interpretation of an IQ score

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How should you interpret an IQ score? The table below has been derived from Resing en Blok (2002)* and provides a clear overview.

IQ Percentage of the population with this IQ Interpretation
> 130 2.1 Very gifted
121-130 6.4 Gifted
111-120 15.7 Above average intelligence
90-110 51.6 Average intelligence
80-89 15.7 Below average intelligence
70-79 6.4 Retarded

 

About 2% of the population has an IQ score lower than 69. Such a low IQ score often is hard to measure using a regular intelligence test. Neither can very high IQ scores be determined accurately. This is because you need a lot of reference measurements to determine a specific score reliably. As very high and very low IQ scores simply do not occur often, this is very hard.

 

Learn more on IQ scores and differences or take an IQ test.

 

* Resing, W.C.M., & Blok, J.B. (2002).The classification of intelligence scores. Proposal for an unambiguous system. The psycholgist, 37, 244-249.