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Given below are the marks obtained by 30 students of a class in a test.
10, 8, 12, 17, 19, 17, 41, 40, 12, 46, 37, 17, 1, 9, 21, 13, 48, 12, 21, 19, 33, 5, 38, 39, 19, 23, 2, 6, 30, 27.
Using tally marks prepare a frequency table such that 20-30 is a class interval.

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