How to determine the upper control limit, Operation Management

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Six samples of subgroup size 5 (n=5) were collected. Determine the upper control limit (UCL) for an X-Bar chart if the mean of the sample averages is 4.7 and the mean of the sample ranges is 0.35.

Factors for calculating control limits:

n A2 D3 D4
2 1.880 0 3.267
3 1.023 0 2.575
4 0.729 0 2.282
5 0.577 0 2.115
6 0.483 0 2.004

UCL = 4.86905
UCL = 4.90195
UCL = 4.72250
UCL = 5.05805


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