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Frequency polygonCovid-19 has led the world to go through a phenomenal transition . E-learning is the future today. Stay Home , Stay Safe and keep learning!!! Frequency polygon is another way to show the information in a frequency table. It looks a little bit like a line graph. To make a frequency-polygon, you just need to plot a few points and then join the points by straight lines.Frequency-polygon of a given frequency distribution can be drawn in two ways. 1) By using histogram 2) Without using histogram After drawing a histogram, obtain the midpoints of each class. The midpoint of a class is the point in the middle of the class. So for instance, if I have a class “10 – 19", then the midpoint is ( 10+19)/2 = 14.5. A class of “0 – 5" has a midpoint of 2.5. Join these mid points of the adjacent rectangles of the histogram by dotted line segments. Obtain the mid points of two class intervals of zero frequency on X-axis, one adjacent to the first, on its left and one adjacent to the last, on its right. These class-intervals are known as imagined class intervals. Note : Sometimes imagined class intervals do not exist. For example marks obtained by the students in a test, we can not go below zero and beyond maximum marks on the two sides. In such cases extreme line-segments are partly drawn and are brought down vertically so that they meet with the vertical sides of first and the last rectangles. Example without using histogram :
Note: Class marks are obtained by adding the age in years and divide it by 2. ![]() Graph Dictionary Home Page Covid-19 has affected physical interactions between people. Don't let it affect your learning.
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