The arrival time of an elevator in a 12-story dormitory is equally likely at any time
range during the next 4 minutes.
(i) Calculate the expected arrival time.
(ii) What is the probability that an elevator arrives in less than 1½ minutes?
(iii) What is the probability that the wait for an elevator is more than 1½ minutes?
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it is The arrival time of an elevator in a 12-story dormitory is equally likely at any time range during the next 3.8 minutes.
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