If daily demand is normally distributed with a mean of 15 and standard deviation of 5, and lead time is constant at 4 days, 90% service level will require safety stock of approximately

A) 7 units.
B) 10 units.
C) 13 units.
D) 16 units.
E) 26 units.

Safety Stock

Inventory kept on hand as a buffer against variability in demand or supply, to avoid out-of-stock situations.

Standard Deviation

A measure of the dispersion or spread of data points in a data set, indicating how much variation there is from the average.

Service Level

A measure of the quality of service provided by a business, often evaluated against customer expectations or industry standards.