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The most reputable and widely used IQ tests used at present -- the individual (psychologist- or psychometrist-administered) WISC, WAIS, SB4 and SB5 -- are designed to have population average IQs of 100, with a standard deviation of 15. On such tests, the 90th percentile IQ is 119.

On older individual and some group tests, the 90th percentile IQ may differ (usually, it is a bit higher -- 120 or 121). IQ scores and percentiles obtained from most online tests are not comparable to the individual IQ test results quoted here and should not be relied upon in clinical, employment-related, or educational situations.

By the way, the IQ coinciding with 1 standard deviation above the mean is 115. An IQ of 115 is at the 84th percentile on the standard individual tests, and so must be considered a moderately high score. The 90% percentile score of 119 is at the lower limit of what might be considered a high, or clearly above average, IQ score.

An IQ of 132 (98th percentile) or higher is required to join Mensa.

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11y ago

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