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Empirical rule percentages9/27/2023 According to the 68-95-99.7 rule, what percentage of adults are considered retarded by this criterion? ![]() People with WAIS scores below 70 are considered mentally retarded. The scale is approximately normal with mean 100 and standard deviation 15. The Wechsler Adult Intelligence scale (WAIS) is a commonly used IQ test.
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