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Question: mcburgers fastfood restaurant has a drivethrough window with a single...

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McBurger's Fast-food restaurant has a drive-through window with a single server who takes orders from an intercom and is also the cashier. The window operator is assisted by other employees who prepare the orders. Customers arrive at the ordering station prior to the drive-through window every 3.6 minutes (exponentially distributed) and the service time is 2.4 minutes (exponentially distributed). Determine the probability of no customers in the system.

a. -0.108

b. 1.500

c. 0.667

d. 0.333

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