Question 1
Demand for a product is approximately normal, averaging 5 units per day with a standard deviation of 1 unit per day. Lead time for this product is approximately normal, averaging 10 days with a standard deviation of 3 days. What reorder point provides a service level of 90%?
Question 2
A product has a reorder point of 260 units, and is ordered ten times a year. The following table shows the historical distribution of demand values observed during the reorder period.
Demand | Probability |
240 | .1 |
250 | .2 |
260 | .4 |
270 | .2 |
280 | .1 |
Currently, stockouts are valued at $5 per unit per occurrence, while inventory carrying costs are $2 per unit per year. Should the firm add safety stock? If so, how much safety stock should be added?