申論題

5. A gas station use of oil is normally distributed with a mean of 8 tanks per day and a standard deviation of 1 tank per day. Lead time for delivery of the oil is 4 days. If the manager wants a service level of 99 percent (i.e., z=2.33),

(2) In addition to the random oil demand, given the lead time for delivery of the oil is stochastic and follows normal with a mean of 4 days and a standard deviation of 1 day, what reorder point should be used? And argue whether the prior reorder point is always equal or less that the latter one.