Final answer:
The expected service level should be approximately 85%.
Step-by-step explanation:
The expected service level should be approximately 85%.
The standard deviation is used to determine the amount of safety stock needed to achieve a desired service level. In this case, if they keep one standard deviation of safety stock, it means they want to have enough stock to cover 68% of the demand (since approximately 68% of the data is within one standard deviation of the mean).
Therefore, the expected service level would be approximately 100% - 68% = 85%.