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Published byThomasine Manning Modified over 9 years ago

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Cumulative frequency Example The frequency table shows the examination marks of 80 students. MarkFrequency 0 -102 10 -204 20 -307 30 -4014 40 -5023 50 -6013 60 -708 70 -806 80 -902 90 -1001 Total80 a)Draw a cumulative frequency table and cumulative frequency curve to represent this data. b)Find the median and interquartile range for this data.

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Weight (w kg) Frequency112285 Example The table below shows the results in a recent survey on the weights of boys in a particular school. a) Draw a cumulative frequency table and cumulative frequency curve to represent this data. b) Find the median and interquartile range for this data.

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Example The masses of 150 girls were obtained and placed in the table below. Mass (kg) 35 – 4040 – 4545 – 5050 – 5555 – 6060 – 6565 – 7070 – 75 Frequency5243028272673 a) Draw a cumulative frequency polygon which represents this data b) Find the median mass for these girls c) Find the interquartile range for this data d) What percentage had a weight less than 47kg?

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Example The table below shows the age distribution of 200 people in a factory Age15 – 2020 – 2525 – 3030 – 4040 – 5050 – 60 Frequency185963202515 a) Draw a cumulative frequency curve to represent this data b) Use the curve to estimate the median c) What is the interquartile range for this data?

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