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In a queueing system, customers arrive once every 4 minutes (standard deviation = 7) and services take 3 minutes (standard deviation = 6.6). What

In a queueing system, customers arrive once every 4 minutes (standard deviation = 7) and services take 3 minutes (standard deviation = 6.6). What is the average time a customer will spend in the queue (in minutes)? Note: Do not round intermediate calculations. Round your answer to 3 decimal places.

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