Joseph has taken two tests in his chemistry class. He scored 72 on the first test, for which the mean of all scores was 65 and the standard deviation was 8. He received a 60 on a second test, for which the mean of all scores was 45 and the standard deviation was 12. In comparison to the other students, did Joseph do better on the first test or the second test? By what percent did he do better?

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