Step-by-step explanation:
Given that
Mean lead time demand = 50
Standard deviation = 60
Service level = 90%, so the service level is 1.28
So by considering the above information , the safety stock is
a. Safety stock = Value of service level × standard deviation
= 1.28 × 7
= 8.96
b. And, the appropriate reorder point is
= Mean lead time demand + safety stock
= 60 + 8.96
= 68.96