A doctor's office staff studied the waiting times for patients who arrive at the office with a request for emergency service. The following data with waiting times in minutes were collected over a one-month period.

4

7

11

13

5

3

6

16

10

7

10

8

12

22

5

10

9

13

20

5

Use classes of 0-4, 5-9, and so on in the following.(a)Show the frequency and relative frequency distributions.

Waiting Time	Frequency	Relative Frequency
0-4
5-9
10-14
15-19
20-24
Totals

(b)Show the cumulative frequency and cumulative relative frequency distributions.

Waiting Time	Cumulative Frequency	Cumulative Relative Frequency
Less than or equal to 4
Less than or equal to 9
Less than or equal to 14
Less than or equal to 19
Less than or equal to 24

(c)What proportion of patients needing emergency service wait 9 minutes or less?