Question

@michele_Laino

Answer 1

ok! it is correct!

Answer 2

we have to draw a graph like this:

Answer 3

here is the first step:

Answer 4

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

Answer 5

with that answer, I gave the method in order to draw the cumulative frequency graph

Answer 6

that graph above is the graph of the cumulative frequency, which is different from the graph of the single frequencies

Answer 7

here is the graph of the single frequencies: