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# A manager has the responsibility to manage how tellers provide services to customers. Customers needing

Question: A manager has the responsibility to manage how tellers provide services to customers. Customers needing teller service arrive randomly at a mean rate of 30 per hour. Customers wait in a single line and are served by the next available teller when they reach the front of the line. Each service takes a variable amount of time (assume an exponentialA manager has the responsibility to manage how tellers provide services to customers. Customers needing teller service arrive randomly at a mean rate of 30 per hour. Customers wait in a single line and are served by the next available teller when they reach the front of the line. Each service takes a variable amount of time (assume an exponential distribution), but on average can be completed in 3 minutes. The tellers earn an average wage of \$18 per hour. If two tellers are used, what will be the average waiting time for a customer before reaching a teller? (Note: This is a M/M/2 problem.)
6.23 minutes
4.21 minutes
3.86 minutes
2.76 minutes
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