An analyst with a local investment bank is studying the level of trading activity on Bursa Malaysia (the Malaysian stock market). He has collected the following data, which are weekly average volumes (in millions), over a 29-week period.

172.5	154.6	163.5
161.9	151.6	172.6
172.3	132.4	168.3
181.3	144.0	155.3
169.1	133.6	143.4
155.0	149.0	140.6
148.6	135.8	125.1
159.8	139.9	171.3
161.6	164.4	167.0
153.8	175.6

(a) Construct a histogram.

(b) Calculate

(i) The relative and cumulative relative frequencies

(ii) The mean and variance

(iii) The coefficient of variation