the monthly sales of mufflers in Richmond, VA, area follow the normal distribution with a mean of 1,200 and a standard deviation of 225.

the monthly sales of mufflers in Richmond, VA, area follow the normal distribution with a mean of 1,200 and a standard deviation of 225. The Manufacturer would like to establish inventory levels such that there is only 5 percent chance of running out of stock. Where should the manufcaturer set the inventory levels?