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Cumulative Frequency & Frequency Polygons
Sunday, 18 November 2018
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Example The table below shows the distribution of weekly wages in two small factories Draw a frequency polygon to represent the data Comment on the results Weekly wage (£) 0 - 50 Factory A 1 3 12 11 4 Factory B 5 10 8
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Wage (£) Frequency 20 18 16 14 12 10 8 6 4 2 The two Frequency polygons suggest that Factory B pay lower wages on average.
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Example The table below shows the results in a recent survey on the weights of girls in a particular school. Weight (w kg) Frequency 4 15 11 10 4 19 30 40 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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Interquartile Range = 35 – 27
Weight (kg) Cum Freq 45 40 35 30 25 20 15 10 5 b) Median = 30.5 Interquartile Range = 35 – 27 = 8
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