A grouped frequency distribution table with classes of equal sizes using 63-72 as one of the class is constructed (72 included) for the following data. 30, 32, 45, 54, 74, 108, 112, 66, 75, 88, 40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96, 102, 110, 88, 74, 112, 14, 34, 44,. The number of classes in the distribution will be: ?
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