Clay runs a small hotdog stand in downtown Chapel Hill
Clay runs a small hotdog stand in downtown Chapel Hill. Clay can serve about 30 customers an hour. During lunchtime, customers randomly arrive at a rate of 20 per hour.
a. What percentage of the time is Clay busy?
b. On average, how many customers are waiting to be served? How many are in the system (i.e., waiting and being served)?
c. On average, how long will a customer wait to be served? How long will a customer be in the system?

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