COORDINATES....
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scale
The main difference is that the vertical scale for a frequency graph is in units (or numbers) whereas in a percentage graph, it is in percentages,
Coordinates.
It does not have to. Default settings can do that to avoid cluttering up the area or having overlapping numbers. It could also depend on the major units that are used for the axis.
The answer depends on the nature of the numbers in the table and what you wish to show in the graph. You can graph virtually any set of numbers. For rather an unusual use of graphics see the attached link: