Arrivals

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The time between arrivals of vehicles at a particular intersection follows an exponential probability distribution with a mean of 13 seconds.

What is the probability that the arrival time between vehicles is 12 seconds or less (to 4 decimals)?

What is the probability that the arrival time between vehicles is 6 seconds or less (to 4 decimals)?

What is the probability of 30 or more seconds between vehicle arrivals (to 4 decimals)?