what do you meant by frequency polygon
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Frequency polygons are a graphical device for understanding the shapes of distributions. They serve the same purpose as histograms, but are especially helpful for comparing sets of data. Frequency polygons are also a good choice for displaying cumulative frequency distributions.
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The frequency polygon is a polygon - a closed two-dimensional figure of straight line segments - joining the mid points of the top of the bars of a histogram. ... The first point is on the x-axis (y = 0) and is placed in the middle of the interval which precedes the first bar of the histogram.
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