In a recent study on world​ happiness, participants were asked to evaluate their current lives on a decimal scale from 0 to​ 10, where 0 represents the worst possible life and 10 represents the best possible life. The mean response was 5.75.7 with a standard deviation of 2.42.4. Assume the distribution can be approximated by a normal distribution.   ​(a) What response represents the 9393rdrd ​percentile? ​(b) What response represents the 6161stst ​percentile? ​(c) What response represents the firstfirst ​quartile