Question: 6.45 At a train reservation counter, one man completes his reservation with a mean time of 3 minutes. Service completion time is assumed to follow

6.45 At a train reservation counter, one man completes his reservation with a mean time of 3 minutes.

Service completion time is assumed to follow exponential distribution. Out of the 5 customers in queue, what is the probability that at least 4 will complete their reservation within 3 minutes?

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