A hospital's biomedical repair shop uses a 4-week periodic system to maintain the inventory on the blood pressure cuff repair parts. They use an average 40 adult arm cuffs with a standard deviation of 6 cuffs every 4 weeks. Cuffs aren't the most critical item they carry, but the manager would like to avoid the embarrassment of a stockout at least 95% of the time.
What should their restocking level be?
A. 40 cuffs
B. 46 cuffs
C. 50 cuffs
D. 52 cuffs