Pizza U.S.A., Inc., produces and markets pizzas on a national basis. The shop manager decides how many pizzas to be made. He learns that daily demand for pizza follows a normal distribution of mean 150 and standard deviation 30.

If the manager has materials to make only 168 pizzas for a given day with the raw materials available with him, how much are the expected lost sales assuming there is no way that additional raw materials can be purchased for that day?