SOLUTION: the average arrival rate of persons in a queue is 1.5 per hour. what is the probability that at most 20 will arrive during an interval of 6 hours?

Question 1120107: the average arrival rate of persons in a queue is 1.5 per hour. what is the probability that at most 20 will arrive during an interval of 6 hours?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is a Poisson distribution and is proportional to time. Here, the relative unit of observation is 6 hours.
With a parameter of 9 (for 6 hours), what is the probability the value will be no more than 20.
This is 0.9996.

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