Calls To The Help Line Of Large Computer Distributor

Calls to the help line of a large computer distributor follow a Passion distribution with a mean of 20 calls per minute.
(a) What is the mean time until the one-hundredth calls?
(b) What is the mean time between call numbers 50 and 80?
(c) What is the probability that three or more calls occur within 15 seconds?

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