The number of requests for assistance received by a towing service is a Poisson process with rate

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The number of requests for assistance received by a towing service is a Poisson process with rate α = 4 per hour.
a. Compute the probability that exactly ten requests are received during a particular 2-hour period.
b. If the operators of the towing service take a 30-min break for lunch, what is the probability that they do not miss any calls for assistance?
c. How many calls would you expect during their break?
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