What is the expected length of time

Reference no: EM13193927

Suppose there are two tellers at a bank and each takes an exponential length of time with parameter 1/2 to serve a customer. All the service times are independent. Tom and Ruth show up at the bank and find one teller is helping Alan, the other is helping Betty, and no one else is waiting. What is the expected length of time before Alan, Betty, Tom, and Ruth are all finished.

Reference no: EM13193927

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