question archive Assume that adults have IQ scores that are normally distributed   with a mean of 99

Assume that adults have IQ scores that are normally distributed   with a mean of 99

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Assume that adults have IQ scores that are normally distributed   with a mean of 99.7 and a standard deviation 24.6. Find the first quartile   Upper Q 1?, which is the IQ score separating the bottom? 25% from the top?   75%.    

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