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Waiting Lines Problem. Givens: a) u = 45 customers per hour. What is the probability that 2 customers will arrive during a 1-minute period. Givens: b) What is the probability of 5 or more arrivals during a 1-minute period? 2= 0.75 Givens: Waiting Lines Problem. A single food server can process an average of 60 orders per hour. Compute the probability of an order being able to be processed in 0.5 minutes or less