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I have a question about expected waiting times at a bank. Consider a bank with two tellers. Three people, A, B and C enter the bank at almost the same time and in that order. A and B go directly into service while C waits for the first avaliable teller. Suppose that the service time for teller one is exponentially distributed with mean 3 and teller two with mean 6. a) What is the expected total amount of time for C to complete her business? b) What is the expected total time until the last of the three customers leaves? c) What is the probability C is the last one to leave?

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    Do you have any thoughts? Any partial progress?2011-05-26
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    To quote myself about the question you asked four minutes later than this one: *What do you know? What have you tried? Where are you stuck?*2011-05-26

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