should we start cumulative frequency graphs at 0?

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blabla1184
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#1
Report Thread starter 3 years ago
#1
I'm going over past papers and I'm supposed to plot a cumulative frequency graph (which I have) and I now have to draw the curve, but my first dot is very close to the bottom of the graph a bit away from the start, should I still join up the dots from 0
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Trefonix
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#2
Report 3 years ago
#2
Cumulative frequency graphs always have the line pass through 0 on the y axis, but not necessarily on the x axis.
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ns_2
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#3
Report 3 years ago
#3
Yes, and no.

Your graph should always have a 'cumulative frequency' (i.e. the y-axis) starting at zero: there will always be a point where the cumulative frequency is 0.

However, the x-axis should only start at 0 if the variable is defined at 0. For example, for the table below, the first point on the graph ought to be (2,0) [technically, (1.5, 0)] - not (0,0)
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