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Frequency polygons
- Intro Lesson3:14
- Lesson: 1a6:28
- Lesson: 1b7:56
- Lesson: 2a5:27
- Lesson: 2b3:06
- Lesson: 2c2:38
- Lesson: 2d3:14
Frequency polygons
Lessons
1) Create a histogram
2) Plot the midpoints for each bar on the histogram
3) Plot a point with a value of zero one bar below the smallest class. Also plot a point with a value of zero one bar above the largest class
4) Connect all the data point with a straight line
- IntroductionWhat are frequency polygons?
- 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 polygonb)Using the frequency distribution table construct a cumulative frequency polygon - 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?