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The trains at a certain train station come every 12 minutes. Because passengers arrive randomly, the amount of time they wait for a train is

The trains at a certain train station come every 12 minutes. Because passengers arrive randomly, the amount of time they wait for a train is uniformly distributed.

a. What percentage of passengers wait less than 3 minutes for a train?

b. What percentage of passengers wait between 3 and 9 minutes for a train?

c. What percentage of passengers wait between 9 and 15 minutes for a train?

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