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4. (1 point) A barber shop serves n customers in a queue. They have service times tl,...mm. Only one customer can be served at any

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4. (1 point) A barber shop serves n customers in a queue. They have service times tl,...mm. Only one customer can be served at any time. The waiting time for any customer is the sum of the service times of all previous customers. How would you order the customers so that the total waiting time for all customers will be minimized? Carefully justify your

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