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Can you compute this in R? Calls to the help line of a large computer distributor follow a Poisson distribution with a mean of 20

Can you compute this in R?

Calls to the help line of a large computer distributor follow a Poisson distribution with a mean of 20 calls per minute.

(a) What is the mean time until the one-hundredth call? (3 points)

(b) What is the mean time between call numbers 50 and 80? (3 points)

(c) What is the probability that three or more calls occur within 15 seconds? (5 points)

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