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Mathematics, 11.02.2020 18:14 hahalol123goaway

At a fast-food restaurant, if the average time to serve a customer is 3.75 minutes for 10 samples of size 5, and the average range for the samples is 0.50 minutes, the upper and lower control limits for a 3-sigma x̄-chart are
a. UCL = 5.08, LCL = 4.94
b. UCL = 5.75, LCL = 1.75
c. UCL - 3.91, LCL - 3.60
d. UCL - 4.04, LCL - 3.46

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