6) 4.2.7(213) The arrival times of workers at a factory first-aid room satisfy a Poisson process with an average of 1.8 per hour.
(a) What is the value of the parameter y of the Poisson process?
(b) What is the expectation of the time between two arrivals at the first-aid room?
(c) What is the probability that there is at least 1 hour between two arrivals at the first-aid room?
(d) What is the distribution of the number of workers visiting the first-aid room during a 4-hour period?
(e) What is the probability that at least four workers visit the first-aid room during a 4-hour period?
(This problem is continued in Problem 4.3.6.)