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# 问题

Questions in category: 概率论 (Probability).

## [Exer8-4] Exercise 81 of Book {Devore2017B} P.138

Posted by haifeng on 2020-04-07 08:04:52 last update 2020-04-08 17:45:56 | Answers (1) | 收藏

The number of requests for assistance received by a towing service(牵引服务/牽引服務/service de remorquage) is a Poisson process with rate $\alpha=4$ 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 services 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?