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The red blood cell counts​ (in millions of cells per​ microliter) for a population of adult...

The red blood cell counts​ (in millions of cells per​ microliter) for a population of adult males can be approximated by a normal​ distribution, with a mean of 5.2 million cells per microliter and a standard deviation of 0.4 million cells per microliter. ​(a) What is the minimum red blood cell count that can be in the top 22​% of​ counts? b) What is the maximum red blood cell count that can be in the bottom of​ counts 11% of counts ?

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