Phone calls

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Phone calls arrive at the rate of 24 per hour at the reservation desk for Regional Airways.

Compute the probability of receiving two calls in a 10-minute interval of time.(to 4 decimals)
b. Compute the probability of receiving exactly 11 calls in 15 minutes.(to 4 decimals)
c. Suppose no calls are currently on hold. If the agent takes 5 minutes to complete the current call, how many callers do you expect to be waiting by that time?
What is the probability that none will be waiting?(to 4 decimals)
d. If no calls are currently being processed, what is the probability that the agent can take 3 minutes for a personal time without being interrupted by a call?(to 4 decimals)