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 experience, a music store finds that the mean number of cds sold in a sale is 845, the standard deviation is 15, and a histogram of the demand is approximately normal. The manager is willing to accept a 2. 5% chance that a cd will be sold out. About how many cds should the manager order for an upcoming sale?.