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 10:10 the switchboard will receive exactly 10 calls? b. What is the probability that between 10:00 and 10:15 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? Please show working.
Added by Nicol-S B.
Step 1
Since the average number of calls received in a 30-minute period is 15, we can find the average number of calls received in other time periods by dividing 15 by the appropriate factor. a. For the 10-minute period between 10:00 and 10:10, the average number of Show more…
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