Suppose you open a kiosk at the mall every October to sell Halloween costumes. The most popularcostume historically has been a skeleton costume.You can buy the costume for $$10$ and sell it for $$30.$Any costumes not sold have to be disposed ofbecause the design changes each year andcustomers will not purchase a previous yearscostume. Disposal and salvage costs are minimaland can be considered zero. Suppose that in the past, sales of skeleton costumeshave averaged $200$ units per year with a standarddeviation of $15$ units.

How many to order this year?