Michael is taking a self-paced math class. His scores for each of the 20 quizzes during the academic year are shown below. Quiz scores: 80 71 88 85 77 89 73 87 87 86 85 75 72 84 89 73 81 68 86 75 a. Construct a frequency distribution for the grouped data using the following classes with width 6: 66 to 71 72 to 77 78 to 83 84 to 89 b. Calculate the relative frequency for each class.

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