The arrival time of an elevator in a 12-story dormitory is equally likely at any time range during the next 4.2 minutes.

a.	Calculate the expected arrival time. (Round your answer to 2 decimal places.)

Expected arrival time

b.	What is the probability that an elevator arrives in less than 2.8 minutes? (Do not round intermediate calculations. Round your answer to 4 decimal places.)

Probability

c.	What is the probability that the wait for an elevator is more than 2.8 minutes? (Do not round intermediate calculations. Round your answer to 4 decimal places.)

Probability