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An intelligence quotient, or IQ, is a score derived from one of several different standardized tests designed to assess intelligence. IQ test scores are used in many contexts: as predictors of educational achievement or special needs, by social scientists who study the distribution of IQ test scores in populations and the relationships between IQ score and other variables, and as predictors of job performance and income. The average IQ test scores for many populations have been rising at an average rate of three points per decade since the early 20th century. IQ test scores have been shown to be associated with such factors as morbidity and mortality, social status, and to a substantial degree, offspring IQ. Learn More about the human mind and IQ Tests. |
 The IQ test is scored so that the mean score is 100 and the distribution has the shape of a Gaussian function, with a standard deviation of 15. The plot shows the percentage of people getting a score versus the score itself, from 55 to 145 IQ. |