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3.2 IQ test scores. The Wechsler Adult Intelligence Scale (WAIS) is the most common \IQ test." The scale of scores is set separately for each age group and is approximately Normal with mean 100 and standard deviation 15. According to the68-95-99.7 rule, about what percent of people have WAIS scores(a) above 100?(b) above 145?(c) below 85?Answer: 3.2 IQ test scores. (a) About 1/2 have IQ scores above the mean of 100 (b) About .30/2=.15 or 15% of adults have scores above 145 which is 3 standard deviations above the mean. (c) About 0.50- 0.34 = 0.16 or 16% of adults have scores below 85 which is 1 standard deviation below the mean.(c) About .34/2=.17 or 17% of adults have scores below 85 which is 1 standard deviation below the mean ................
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