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Assume that adults have IQ scores that are normally distributed with a mean of 95.5 and a standard deviation 21.7 Find the first quartile Q1

Assume that adults have IQ scores that are normally distributed with a mean of 95.5 and a standard deviation 21.7 Find the first quartile Q1 which is the IQ score separating in the bottom 25% from the top 75%

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