Explain with examples ways of presenting cumulative frequency series

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Example 1: The marks obtained by 35 students in a class are given below. Construct the cumulative frequency table : Marks obtained Number of students 0 1 1 2 2 4 3 4 4 3 5 5 6 4 7 6 8 3 9 2 10 1 Solution: What is Cumulative Frequency in statistics 1 Example 2: The distribution of ages (in years) of 40 persons in a colony is given below. Age (in years) Number of Persons 20-25 7 25-30 10 30-35 8 35-40 6 40-45 4 45-50 5 (a) Determine the class mark of each class (b) What is the upper class limit of 4th class (c) Determine the class size Solution: (a) Class marks are What is Cumulative Frequency in statistics 2 = 22.5, 27.5, 32.5, 37.5, 42.5, 47.5 (b) The fourth class interval is 35–40. Its upper limit is 40 (c) The class size is 25 – 20 = 5
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