Dunstreet's Department Store would like to develop an inventory ordering policy of a 99 percent probability of not stocking out. To illustrate your recommended procedure, use as an example the ordering policy for white percale sheets.
Demand for white percale sheets is 3,100 per year. The store is open 365 days per year. Every three weeks (21 days) inventory is counted and a new order is placed. It takes 14 days for the sheets to be delivered. Standard deviation of demand for the sheets is seven per day. There are currently 170 sheets on hand.
How many sheets should you order? (Use Excel's NORMSINV() function to find the correct critical value for the given α-level. Do not round intermediate calculations. Round "z" value to 2 decimal places and final answer to the nearest whole number.)
Hint: if you don't know how to use NORMSINV() function to find the z-value for a given % level, watch the "Hint" video by clicking the "Hint" button on the left.