Quick Print Inc. uses plain paper for copying needs. Weekly demand for that paper follows a normal distribution with mean 100 and standard deviation 10 (measured in reams). Each week, a replenishment order is placed with its supplier and the order arrives three weeks later. All copying orders that cannot be satisfied immediately due to the lack of paper are backordered. Required
What order up-to level should be used to achieve at least a 90% in-stock probability?

Which of the following describes one of the ways that the demographics of an area affect the price of housing in that area? a. when more people have children, their incomes tend to be higher and the housing prices are also higher. b. older people are more likely to stay in their houses, creating a seller's market that keeps prices low. c. an area with a lower population density won't have enough construction workers to build new houses quickly. d. an area with younger people will have a higher demand for rentals and a lower demand for buying.