During the 3pm to 5pm time period cars arrive at a banks, Ask an Expert

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During the 3pm to 5pm time period, cars arrive at a banks drive through window at an average rate of 15 customers per hour. Asuume that the time between arrivals follows the expotentional distribution. What is the probability that a randomly selected customer will arrive between 2 and 6 minutes after the previous customer?

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