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Question: Wechsler Adult Intelligence Scale (WAIS) Scores
The scale of scores on the WAIS are approximately Normal with mean 100 and standard deviation 15.
Answer the following questions:
(a) The organization MENSA, which calls itself "the high-IQ society", requires an IQ score of 130 or higher for membership. What percent of adults would qualify for membership?
(b) Corrine scores 118 on such a test. How far away from the mean is she (or how many standard deviation units away from the mean is she)?
(c) Corrine scores higher than what percent of all adults?
(d) Individuals with WAIS scores below 70 are considered mentally retarded, when, for example, applying for Social Security disability benefits. By this criterion, what percentage of adults are retarded?
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