A cumulative frequency table of marks reads: less than 10: 5, less than 20: 13, less than 30: 28, less than 40: 40, less than 50: 50. How many students scored marks in the interval 20–30?

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Accepted Answer

15. The frequency of a class equals the difference of consecutive cumulative frequencies: 28 − 13 = 15 students.

A cumulative frequency table of marks reads: less than 10: 5, less than 20: 13, less than 30: 28, less than 40: 40, less than 50: 50. How many students scored marks in the interval 20–30?

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