Final answer:
Monroe company uses an average of 2,940 feet of conduit during the 6-day lead time, which is calculated by multiplying the daily mean use of 490 feet by 6.
Step-by-step explanation:
The Monroe company lays conduit with a daily demand that is normally distributed with a mean of 490 feet and a standard deviation of 80 feet. If it takes 6 days for the conduit to arrive when ordered, we can calculate the average use of conduit during the lead time by multiplying the daily mean usage by the number of lead time days. Therefore, Monroe uses an average of 2,940 feet of conduit during the lead time (490 feet per day multiplied by 6 days).