What is probability switchboard will receive exactly 10 call


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?

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Basic Statistics: What is probability switchboard will receive exactly 10 call
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