Look at the frequency distribution. Find the class boundaries.
21, 31, 41, 51, 61, 70, 80
25.5, 35.5, 45.5, 55.5, 65.5, 75.5
20.5, 30.5, 40.5, 50.5, 60.5, 70.5
30, 40, 50, 60, 70, 80
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