Question 4 A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance req

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Question 4 A Maintenance Group Improves The Effectiveness Of Its Repair Work By Monitoring The Number Of Maintenance Req 1 (113.09 KiB) Viewed 49 times

Question 4 A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Twenty weeks of data are shown in following table. Find trial control limits for this process. Second Visit Second Visit Total Total Week Requests Required Week Requests Required 1 200 6 11 100 1 2 250 8 12 100 0 3 250 9 13 100 1 4 250 7 14 200 5 200 3 15 200 6 200 4 16 200 7 150 2 17 200 8 150 1 18 200 9 150 0 19 250 10 150 2 20 250 4 5 3 10 4 7 6