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