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red blood cell count for a population of adult males can be approximated by a normal...

red blood cell count for a population of adult males can be approximated by a normal distribution, with a mean of 5.4 million cells per micro-liter and a standard deviation of 0.4 million cells per micro-liter. what is the minimal red blood cell count that can be in the bottom 15% of counts. round to 2 decimals
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