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

  1. Chapter 14 Class 9 Statistics
  2. Serial order wise
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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 = (๐‘ข๐‘๐‘๐‘’๐‘Ÿ ๐‘๐‘™๐‘Ž๐‘ ๐‘  ๐‘™๐‘–๐‘š๐‘–๐‘ก+๐‘™๐‘œ๐‘ค๐‘’๐‘Ÿ ๐‘๐‘™๐‘Ž๐‘ ๐‘  ๐‘™๐‘–๐‘š๐‘–๐‘ก)/2 Class mark for 140 โ€“ 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 โ€“ 145 = 10 First point = 145 โ€“ 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 provides courses for Mathematics from Class 9 to 12. You can ask questions here.
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