The Truly Canadian Restaurant stocks a private red table wine that it purchases from a local winery in the Niagara Falls region. The daily demand for the wine at the restaurant is normally distributed with a mean of 18 bottles and a standard deviation of 4 bottles. The winery sends a representative to check the restaurant's wine cellar every 30 days, and during a recent visit there were 25 bottles in stock. The lead time to receive an order is two days. Can you help the restaurant manager to determine the optimal order size that will enable him to limit the probability of a stockout to 5%?