Prepare the cumulative frequency table with the class interval of 10 from the following marks obtained by the students.
10, 32, 21, 12, 4, 28, 16, 24, 33, 14, 35, 11, 39, 30, 21, 31, 7, 29, 20, 27, 25, 23, 21, 13, 33
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class interval frequency CF
0-10 2 2
10-20 6 8
20-30 10 18
30-40 7 25
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