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What is the probability that a stock- out condition occur

Assignment:

A manufacturing company regularly consumes a special type of glue pur- chased from a foreign supplier. Because the supplier is foreign, the time gap between placing an order and receiving the shipment against that order is long and uncertain. This time gap is called "lead time." From past experience, the materials manager notes that the company's demand for glue during the uncertain lead time is normally dis- tributed with a mean of 187.6 gallons and a standard deviation of 12.4 gallons. The company follows a policy of placing an order when the glue stock falls to a pre- determined value called the "reorder point." Note that if the reorder point is xgallons and the demand during lead time exceeds xgallons, the glue would go "stock-out" and the production process would have to stop. Stock-out conditions are therefore serious.

a. If the reorder point is kept at 187.6 gallons (equal to the mean demand during lead time) what is the probability that a stock-out condition would occur?

b. If the reorder point is kept at 200 gallons, what is the probability that a stock- out condition would occur?

c. If the company wants to be 95% con?dent that the stock-out condition will not occur, what should be the reorder point? The reorder point minus the mean demand during lead time is known as the "safety stock." What is the safety stock in this case?

d. If the company wants to be 99% con?dent that the stock-out condition will not occur, what should be the reorder point? What is the safety stock in this case?

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