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 5.7 with a standard deviation of 2.4. (a) What response represents the 86th percentile? (b) What response represents the 64th percentile? (c) What response represents the first quartile? (a) The response that represents the 86th percentile is (Round to two decimal places as needed.)