Question

How do I work out the cumulative frequency in a graph I don't need the answers but I need a way to solve it

Answer 1

The sum of all the previous columns.

so 3, 13, 34, 38, 39

Explanation:

The left column should I.M.O. then be

C<5

C<10

C<15

C<20

C<25

so the interval should not be bounded at the left.