Question: A company has 4 ( c = 4 ) telephone lines. Customers form a single queue once calling. They arrive every two minutes. (

A company has 4(c=4) telephone lines. Customers form a single queue once calling. They arrive every two minutes. (\lambda =1/2). The average duration of a call is 4 minutes (\mu =1/4). What is the average queue length?

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