A plumbing contractor was interested in making her operation more efficient by cutting down on the average distance between service calls while still maintaining at least the same level of business activity. One plumber (plumber 1) was assigned a dispatcher who monitored all his incoming requests for service and outlined a service strategy for that day. Plumber 2 was to continue as she had in the past, by providing service in roughly sequential order for stacks of service calls received. The total daily mileages for these two plumbers are recorded here for a total of 18 days (3 workweeks).
Plumber 1 | 88.2 | 94.7 | 101.8 | 102.6 | 89.3 | 95.7 |
| 78.2 | 80.1 | 83.9 | 86.1 | 89.4 | 71.4 |
| 92.4 | 85.3 | 87.5 | 94.6 | 92.7 | 84.6 |
Plumber 2 | 105.8 | 117.6 | 119.5 | 126.8 | 108.2 | 114.7 |
| 90.2 | 95.6 | 110.1 | 115.3 | 109.6 | 112.4 |
| 104.6 | 107.2 | 109.7 | 102.9 | 99.1 | 115.5 |
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