9. The marks obtained by 40 students of a class in an examination are given below. Present thedata in the form of a frequency distribution using equal class-size, one such class being 10 -15 (15 not included).
3, 20, 13, 1 21, 13, 3. 23, 16, 13, 18, 12, 5, 12, 5, 24, 9, 177, 18,
20, 3. 10, 12, 7, 18, 2 5, 7, 10, 16, 8, 16, 17, 8, 23, 21, 6, 23, 15
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7 is the right answer. .. .. because 7 numbers are present between 10 to 15 and also 15 is not included.
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