In a recent study on world happiness, participants were asked to evaluate their current lives on a scale from 0 to 10, where 0 represents the worst possible life and 10 represents the best possible life. The mean response was 5.4 with a standard deviation of 2.6.

(a) What response represents the 86th percentile?

(b) What response represents the 61st percentile

(c) What response represents the first quartile?

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 5.9 million cells per microliter and a standard deviation of 0.3 million cells per microliter.

(a) What is the minimum red blood cell count that can be in the top 21% of counts?

(b) What is the maximum red blood cell count that can be in the bottom 13% of counts?