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Question
The average number of calls received by a switchboard in a 30-minute period is 15.a. Define the random variable in words for this experiment.
b. What is the probability that between 10:00 and 10:30 the switchboard will receive exactly 10 calls?
c. What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
d. What is the probability that between 10:00 and 10:30 the switchboard will receive fewer than 7 calls?
Answer
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