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Question

Find the area under the frequency polygon formed using the following data

Cost of living indexNumber of weeks14015051501601016017020170180918019061902002


  1. 520

  2. 420

  3. 530

  4. 540


Solution

The correct option is D

540



The frequency polygon can be drawn as above. It can be divided into rectangles and triangles.
Finding the areas of all of them, area under the frequency polygon = 485. 

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