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The average number of calls received by a switchboard in a 30 minute period is 20....

The average number of calls received by a switchboard in a 30 minute period is 20.
(A) What is the probability that between 10 and 10:30 the switchboard will recieve exaxtly 5 calls?
(B) What is the probability that between 10 and 10:30 the switchboard will recieve more than 9 calls but less than 15 calls?
(C) What is the probability that between 10 and 10:30 the switchboard will receive less than 7 calls?

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