Question: USE WORD DOCUMENT NOT HANDWRITTEN A cafeteria serving line has a coffee urn from which customers serve themselves. Arrivals at the urn follow a Poisson

USE WORD DOCUMENT NOT HANDWRITTEN A cafeteria serving line has a coffee urn from which customers serve themselves. Arrivals at the urn follow a Poisson distribution at the rate of three per minute. In serving themselves, customers take about 15 seconds, exponentially distributed.

Use Model 1, = 3 / minute, = 4 / minute

How many customers would you expect to see on average at the coffee urn?
How long would you expect it to take to get a cup of coffee?
What percentage of time is the urn being used

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