Rents per person (to the nearest $) for 83 flats and houses advertised on the notice boards at a university were collected and the following grouped frequency distribution compiled:

Rent per person                     Frequency

35 - 39                                         13

40 - 44                                         29

45 - 49                                         22

50 - 54                                         10

55 - 59                                          7

60 - 64                                           2

a) Plot a histogram to portray this distribution and comment on the shape of the distribution.

b) Find the cumulative frequency for each class

c) Plot a cumulative frequency graph of the distribution