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 2.4. ​(a) What response represents the 90th ​percentile? ​(b) What response represents the 63rd ​percentile? ​(c) What response represents the first quartile?

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