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 860 CDs should the manager order for an upcoming sale.
What is the law of supply?
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