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Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Let X be the IQ scores for adults.

What is the IQ score separating the bottom 20% from the top 80%. Use the normal curve to explain your answer

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