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Example 9 - In a city, the weekly observations made in - Examples

Example 9 - Chapter 14 Class 9 Statistics - Part 2
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Example 9 In a city, the weekly observations made in a study of cost of living index are given in the following table Draw a frequency polygon for the data above (without constructing a histogram). Class mark = (π‘’π‘π‘π‘’π‘Ÿ π‘π‘™π‘Žπ‘ π‘  π‘™π‘–π‘šπ‘–π‘‘+π‘™π‘œπ‘€π‘’π‘Ÿ π‘π‘™π‘Žπ‘ π‘  π‘™π‘–π‘šπ‘–π‘‘)/2 Class mark for 140 – 150 interval = (150 + 140)/2 = 290/2 = 145 We plot class-marks on x axis and number of weeks on y axis Calculating points where frequency = 0 Difference = 155 – 145 = 10 First point = 145 – 10 = 135 Last point = 195 + 10 = 205 So, we plot points (135, 0) & (205, 0)

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.