Pep Zone sells auto parts and supplies including a popular multi-grade motor oil. When the stock of this oil drops to 40 gallons, a replenishment order is placed. The store manager is concerned that sales are being lost due to stockouts while waiting for a replenishment order. It has been determined that demand during replenishment lead-time is normally distributed with a mean of 25 gallons and a standard deviation of 9 gallons. The manager would like to know the probability of a stockout during replenishment lead-time. In other words, what is the probability that demand during lead-time will exceed 30 gallons? PS: Compute and make a graph in excel also include the Z-table, send the screenshot.

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