What IQ scores mean: the average, percentiles, ranges and the bell curve.
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IQ scores rose across the twentieth century, which makes old test norms easy to beat. What studies found on the size, the possible causes and the declines in some recent samples, and what it means for your score.
IQ can rise a little, mostly through years of education. Brain-training games show no reliable gain, and a retake score reads high on average. What controlled studies found, with sources.
An IQ percentile compares you with a test's norm group. It does not count right answers. A score-to-percentile chart, the calculation, and why your percentile is a range.
The average IQ is 100 because tests are scored that way: the norming sample's mean is set to 100 and the standard deviation to 15 (APA, 1996). Learn what the score bands and their labels mean.
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