014. Cumulative Relative Frequency Distribution

A Cumulative relative frequency distribution expresses the cumulative frequency of each class relative to the entire sample. The cumulative process can be based on a more-than or less-than principle. A less-than cumulative relative frequency distribution is shown in Table 2.9. The last column provides the information in which we are interested. It shows, for example, 80 percent of the time less than 90 passengers boarded P&P airplanes.

Table 2.9 – Less-Than Cumulative Relative Frequency Distribution for the Number of Passengers

Class (passengers)	Frequency (days)	Cumulative Frequency (days)	Cum. Relative Frequency
Less than 50	0	0	0/50 = 0%
Less than 60	3	3	3/50 = 6%
Less than 70	7	10	10/50 = 20%
Less than 80	18	28	28/50 = 56%
Less than 90	12	40	40/50 = 80%
Less than 100	8	48	48/50 = 96%
Less than 110	2	50	50/50 = 100%

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