Question: 4. A process control chart shows the process average (mean) of 6.5 days from order receipt to order fulfillment with an average range of 1.6
4. A process control chart shows the process average (mean) of 6.5 days from order receipt to order fulfillment with an average range of 1.6 days. The sample size is 4 orders. What is the upper control limit (UCL) and the lower control limit (LCL) for the process?
a. UCL = 7.67 days LCL = 5.33 days
b. UCL = 5.33 days LCL = 7.67 days
c. UCL = 8.10 days LCL = 4.90 days
d. UCL = 4.90 days LCL = 8.10 days
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