The arrival times of workers at a factory first-aid room satisfy a Poisson process with an average

Question:

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 A 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 one hour between two arrivals at the first-aid room?
(d) What is the of the number of workers visiting the first-aid room during a four-hour period? ,
(e) What is the probability that at least four workers visit the first-aid room during a four-hour period'.' (This problem is continued in Problem4"3.6.)
Distribution
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