If a store runs out of advertised material during a sale customers become upset and the store loses not only the sale but also goodwill. From past experiences a music store find that the mean number of CDs sold in a sale is 845 the standard deviation is 15 and a histogram of the demands is approximately normal. The manager is willing to accept a 2.5% chance that CD will be sold out. About how many CDs should the manager order for the upcoming sale?