In an examination, 40 boys secured the following marks
8, 11, 20, 37, 40, 15, 29, 31, 27, 8, 7, 13, 29, 25, 42, 37, 30, 10, 9, 27, 18, 25, 9, 2, 17, 47, 32, 11, 29, 6, 15, 41, 37, 10, 40, 21, 39, 13, 15, 3.
Represent the data by a frequency table taking one of the class interval to be 20-30
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This is your frequency table
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