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 5.4 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 25% of counts?

(b) What is the maximum red blood cell count that can be in the bottom 15% of counts?

Answer the questions about the specified normal distribution.