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[See Solution] The arrival time of an elevator in a 12-story building is equally likely at any range during next 4 minutes. Calculate the expected arrival

Question: The arrival time of an elevator in a 12-story building is equally likely at any range during next 4 minutes.

Calculate the expected arrival time.
Calculate the standard deviation of arrival time.
What is the probability that an elevator arrives in less than 90 seconds?
What is the probability that the wait time for an elevator is more than 120 minutes?

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[See Solution] The arrival time of an elevator in a 12-story building is equally likely at any range during next 4 minutes. Calculate the expected arrival

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