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ok! it is correct!
we have to draw a graph like this:
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here is my answer:
the cumulative frequency at the k-interval, is the sum of the single frequencies from the first interval frequency to the k-th interval frequency
with that answer, I gave the method in order to draw the cumulative frequency graph
that graph above is the graph of the cumulative frequency, which is different from the graph of the single frequencies
here is the graph of the single frequencies:
I think that a possible answer is the one which I wrote before, namely:
"the cumulative frequency at the k-interval, is the sum of the single frequencies from the first interval frequency to the k-th interval frequency"