Frequency polygons

Lessons

• Introduction
  What are frequency polygons?

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• 1.
  Constructing a Frequency Polygon from a Frequency Distribution
  The following frequency table shows the amount of time it took 45 ski racers to complete a ski course:
  

  Lower Limit:	Upper Limit:	Frequency:	Cumulative Frequency:
  80 seconds	86 seconds	3	3
  86 seconds	92 seconds	5	8
  92 seconds	98 seconds	12	20
  98 seconds	104 seconds	8	28
  104 seconds	110 seconds	16	34
  110 seconds	116 seconds	11	45

  a)

  Using the frequency distribution table construct a frequency polygon
  
  
  b)

  Using the frequency distribution table construct a cumulative frequency polygon
  
  

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• 2.
  Interpreting a Frequency Polygon
  The frequency polygon below shows the wind speed during a particular day in San Francisco Bay:
  
  
  a)

  What was the highest wind speed recording during this day? What was the lowest wind speed recorded?
  
  
  b)

  During how many hours in this day was the wind speed recorded?
  
  
  c)

  How many hours of the day had more than 10 knots of wind speed?
  
  
  d)

  How many hours of the day had between 2-6 knots of wind speed?
  
  

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