2. A psychologist estimates the I.Q of 28 students. The values are as follows: 103, 86, 94, 97, 100, 113, 102, 76, 95, 101, 99, 83, 94, 84, 78, 102, 105, 114, 88, 84, 90, 100, 96, 98, 78, 96, 79. Form a frequency distribution with class intervals of width 5 each.

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