Foot Locker uses sales per square foot as a measure of store productivity. Last year, the mean annual sales per square foot was $410 with a standard deviation of $54.38. Suppose you take a random sample of 36 Foot Locker stores operating last year. There is a 84% probability that the sample mean annual sales per square foot is at least $_

a. 356.1638

b. 401.0273

c. None of the answers is correct

d. 463.8362

e.418.9727