The table shows the distribution of the heights of a group of people.

Height	0.4 - 0.5	0.6 - 0.9	1.0 - 1.2	1.3 - 1.4	1.5 - 1.7
Number of people	2	8	12	6	6

(m) (a) Draw a histogram to illustrate the distribution.

(b) Using an assumed mean of 1.1m, find, correct to one decimal place, the mean height of the group.