In a Frequency Polygon, a line graph is drawn by joining all the midpoints of the top of the bars of a histogram. A frequency polygon gives the idea about the shape of the data distribution. The two end points of a frequency polygon always lie on the x-axis.
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yes. An ogive is also known as a cumulative frequency graph.
a cumulative frequency graph mearsure the cumulative frequency on the y-axis and the class boundaries on the x-axis
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It is based on some data.
The ogive never close because they represent non-decreasing functions, and polygon you close it.