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The marks of 30 students of a class, obtained in a test (out of 75), are given below : 

42, 21, 50, 37, 42, 37, 38, 42, 49, 52, 38, 53, 57, 47, 29, 59, 61, 33, 17, 17, 39, 44, 42, 39, 14, 7, 27, 19, 54, 51. 

Form a frequency table with equal class intervals. 

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Marks (class intervals) 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80
No of students 1 4 3 7 7 7 1 0

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