4) A car salesroom wanted to find out how well two new sales people were doing. The revenue for car sales for each employee was
recorded over a period of
several months, and the results were as follows:
Results for Mr Chan
Revenue (£)
fx
Midpoint
(x)
0-
50 000 -
75 000
100 000
125 000 -
150 000
Number of months
(f)
5
11
4
2
2
0
Midpoint
fx
Results for Mr Hazim
Revenue (£) Number of months
(f)
0-
6
50 000
8
75 000 -
0
U
100 000
3
125 000 -
3
150 000
0
a) Using linear interpolation find an estimate for the median monthly for each
salesman
b) Find an estimate for the mean monthly revenue for each salesman.