The most important thing in creating intervals for a frequency distribution is that the intervals used must be non-overlapping and contain all of the possible observations.
They are often equal intervals, but sometimes unequal ones are used. It all depends on the data.
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Usually because the frequencies at one or both ends of the distribution are very small.
To make the graph symmetrical
The main utility of a cumulative frequency curve is to show the distribution of the data points and its skew. It can be used to find the median, the upper and lower quartiles, and the range of the data.
A polygon is an unequal six sided shape. A polygon or hexagon is the name used weather the sides are even or not.
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