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The arrival rate of customers at a service window of a...

This question belongs to Management Operations Research
Operations Research
?

The arrival rate of customers at a service window of a cinema hall follows a probability distribution with a mean rate of 45 per hour. If the service rate of the clerk follows poisson distribution, with a mean of 60 per hours, what is the probability of having no customer in the system?

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Correct Answer: Option C
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