The manager of a hairdressing salon was interested to know how long her customers had to wait before being attended to by staff. On a certain day she recorded the waiting times (in minutes) of 15 randomly chosen customers. They are as follows:

14

28

36

15

29

9

16

21

36

17

4

15

22

16

40

For the above data calculate the:

3.1.1 mean waiting time

3.1.2 median waiting time

3.1.3 mean deviation

3.1.4 55th percentile

3.1.5 interquartile range