You have been to investigate the following data for a large building services company

a. Produce a histogram for each of the distribution scaled such that the area of each rectangle represents frequency density and find the mode.

b. Produce a cumulative frequency curve for each of the distribution and find the mediar inter quartile range.

• The mean
• The range
• The standard deviation

Revenue Less than 5 5 and less than 10 10 and less than 15 15 and less than 20 20 and less than 30 30 and less than 40 Number of customers Number of customers (1000) January July 27 38 40 22 13 4 22 39 69 41 20 5