The annual per capita consumption of fresh apples (in pounds) in a nearby state can be approximated by a normal distribution, with a mean of 15.9 pounds and a standard deviation of 4.2 pounds. (a) What is the smallest annual per capita consumption of apples that can be in the top 25% of consumptions?
(b) What is the largest annual per capita consumption of apples that can be in the bottom 15% of consumptions?
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