An IQ score of 100 or less on the WAIS is achieved by about __________ percent of the test takers in any particular age group.

Name: An IQ score of 100 or less on the WAIS is achieved by about __________ percent of the test takers in any particular age group.
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Question

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The WAIS (Wechsler Adult Intelligence Scale) is designed so that the average IQ score is 100, with a standard deviation of 15. This means that about 50% of test takers score 100 or less, as the scores are normally distributed around the mean.

An IQ Score of 100 or Less on the WAIS