Question: If customer interarrival times are exponentially distributed with rate 4 customers per hour, then There is a 28.3% chance that a customer arrives within 5

If customer interarrival times are exponentially distributed with rate 4 customers per hour, then There is a 28.3% chance that a customer arrives within 5 minutes. None of the answers are correct. The average time between arrivals is 12.0 minutes. There is a 36.8% chance that a customer arrives within 15 minutes. There is a 51.3% chance that a customer arrives within 10 minutes
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