The average number of calls received by a switchboard in a 30-minute period is 15
a. What is the probability that between 10:00 and 10:30 the switchboard will receive exactly 10 calls?
b. What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
c. What is the probability that between 10:00 and 10:30 the switchboard will receive fewer than 7 calls?
a. 0.0486
b. 0.3958
c. 0.0075
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