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Cicco manufactures baby shirts based on customer orders

Operations Management

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Cicco manufactures baby shirts based on customer orders. There are two employees making the shirts. The average production time of a shirt is 3 days with a standard deviation of 1.7 days. The company expects to receive 0.5 customer order per day on average and the inter-order follows exponential distribution. Each order is of one shirt. 
What is the expected duration, in days, between when an order is received and when production begins for that order?