A student is not doing so well in a class. On a quiz, he received 13 points (out of 20 points). The class average was 15.5 points with a standard deviation of 1.8. On an exam, he got a score of 68 (out of 100). The class average for the exam was 73 with a standard deviation of 11.2. On which assessment did he doworse relative to his class, the quiz or the exam? Use z-scores to justify your answer. Show your calculations.