Question: An IQ test, I (a) What is the probability that a randomly chosen individual has a WAIS score of 115 or higher? (b) In what

An IQ test, I

(a) What is the probability that a randomly chosen individual has a WAIS score of 115 or higher?

(b) In what range do the scores of the middle 95% of the adult population lie?

Exercises 8.16 to 8.18 refer to the following setting. Th e Wechsler Adult Intelligence Scale (WAIS) is a common “IQ test” for adults. Th e distribution of WAIS scores for persons over 16 years of age is approximately Normal with mean 100 and standard deviation 15.

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