the marks obtained by 60 students of a class in a mathematics test are given below
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Marks No. of students Marks No. of students
10 - 20 2 60 - 70 12
20 - 30 3 70 - 80 14
30 - 40 4 80 - 90 10
40 - 50 5 90 - 100 4
50 - 60 6
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