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WORKSHEET
Kwik-Stop Tyres and Exhausts
Kwik-Stop Tyres and Exhausts want to find out how long customers have to wait for the servicing on their vehicles to be completed. With this knowledge the firm hopes to be able to develop their staff's skills and compete in this very crowded market.
They study the work carried out over a month and produce the following service time table.
Your first task is to draw a cumulative frequency curve (ogive) from the data below. The fastest way to do this is probably by using your computer's spreadsheet package. See our answer for a guide to how your version should look.
Kwik-Stop Tyres and Exhausts
Service Times Chart for April 2001
| Service time (minutes) | Frequency | Cumulative Frequency |
| <30 | 3 | 3 |
| >29 but <45 | 45 | 48 |
| >44 but <60 | 54 | 102 |
| >59 but <75 | 36 | 138 |
| >74 but <90 | 21 | 159 |
| >or = 90 | 6 | 165 |
| Total Frequencies = 165 |
Now answer the following questions:
Find out for Kwik-Stop's managers the number of occasions over the period of study when service time:
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