accummulative frequency graphs?

Question

my gf is stuck with her geology and she has to do one of these, now i did these in maths a year or two back but have forgotten what they are and how to plot them.

can anyone help out?

Answer 1

At each range sum the frequencies up to and including that range. For a small binomial distribution, this looks like
x , f , z
0 , 0 , 0
1 , 1 , 1
2 , 5 , 6
3 , 10 , 16
4 , 10 , 26
5 , 5 , 31
6 , 1 , 32
7 , 0 , 32