Question

A major airline records the number of​ no-shows for the last 70 flights from one city to another. A​ no-show is a passenger who purchases a ticket but fails to arrive at the gate at time of departure. Complete parts a through d below for the​ no-show data in the accompanying table.

number of No-shows

2 4 1 0 3 0 4 3 1 3

4 0 4 1 1 2 3 2 0 0

4 1 4 3 3 4 3 1 1 3

4 3 3 0 2 1 1 0 4 0

1 1 3 2 4 2 2 1 0 3

2 1 2 4 2 0 0 2 2 4

2 3 2 2 3 0 2 4 4 4

c) Using the results from part​ a, calculate the cumulative relative frequencies for each class.

Number	Cumulative Relative Frequency
less than or equals≤0	nothing
less than or equals≤1	nothing
less than or equals≤2	nothing
less than or equals≤3	nothing
less than or equals≤4	nothing

​(Round to the nearest thousandth as​ needed.)

Answer 1

(C) For cumulative frequency, use the formula

Cumulative relative frequency = current class relative frequency + previous class relative frequency

calculation is shown in the table below

Number	Frequency	Relative frequency	Cumulative relative frequency
Less than equal to 0	12	12/70 = 0.171	0.171
Less than equal to 1	13	13/70 = 0.186	0.186+0.171=0.357
Less than equal to 2	16	16/70 = 0.229	0.229+0.357=0.586
Less than equal to 3	14	14/70 = 0.200	0.2+0.586=0.786
Less than equal to 4	15	15/70 = 0.214	0.214+0.786 = 1.000
SUM	70	1