Question: Suppose a fast-food restaurant wishes to estimate average sales volume for a new menu item. The restaurant has analyzed the sales of the item at a similar outlet and observed the following results:

= 500 (mean daily sales)

S = 100 (standard deviation of sample)

n = 25 (sample size)

The restaurant manager wants to know into what range the mean daily sales should fall 95 percent of the time. Perform this calculation.