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

Example 9 - Chapter 14 Class 9 Statistics - Part 2
Example 9 - Chapter 14 Class 9 Statistics - Part 3

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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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.