A machine shop uses a periodic system to maintain the inventory saw blades. The review period is four days and lead time is two days. They use an average of 11 saw blades per day. The standard deviation of use over a six-day period is 9 saw blades. Saw blades aren't the most critical item they carry, but the manager would like to limit the probability of a stockout to 2.5% of the time. What should their restocking level be

Zara, a global retail and apparel manufacturer based in spain that has successfully implemented this idea by having a continuous flow of new products that are typically limited in supply. zara has created a system that draws its clientèle into its stores, on average, 17 times per year as compared to 4 times per year for most stores. how is zara using it to gain competitive advantage? what specific technologies are used by zara to maintain this advantage over its competition?