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The average time to serve a customer at a Tim Hortons drive through is 75 seconds. The average range of service time is 15 seconds.

The average time to serve a customer at a Tim Hortons drive through is 75 seconds. The average range of service time is 15 seconds. Calculate the upper and lower control limits for the drive through using a mean factor, A2 value, of 0.48.

A)83.75 and 66.67

B)75.48 and 74.52

C)90.00 and 60.00

D)82.20 and 67.80

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