The claim department of a company is receiving claims. The time between the arrivals of two consecutive

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The claim department of a company is receiving claims. The time between the arrivals of two consecutive claims (an interarrival time) is an exponential r.v., and the probability that this time is larger than 1 min. equals 1/e. Say without any calculations what the mean interarrival time is. Suppose that it is 2 pm now, and we do know that the last call for a claim was 2 mins ago. What is the probability that the next claim will appear (a) Not earlier than 2:02 pm;  (b) Before 2:02 pm; (c) At 2:02 pm?

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