4 customers waited 2 minutes or less. 10 customers waited 4 minutes or less. 16 customers waited 6 minutes or less. 22 customers waited 8 minutes or less. All 25 customers waited 10 minutes or less.

A cumulative frequency diagram is drawn by plotting the upper class boundary with the cumulative frequency. The upper class boundaries for this table are 35, 40, 45, 50 and 55. Cumulative frequency is ...

Cumulative frequency is a running total of the frequencies. This can be represented on a graph by plotting the upper boundary of the groups. To create a cumulative frequency table all we need to do is ...