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1. Suppose you go to the post office and are equally likely to find 1 or 2 people ahead of you. Suppose the service times

1. Suppose you go to the post office and are equally likely to find 1 or 2 people ahead of you. Suppose the service times of customers are independent and distributed exponentially with mean 4 minutes (and that only one window is open, so customers are helped one at a time). What is the probability that you wait more than 6 minutes before being helped?

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