Problem 11-4 The local supermarket buys lettuce each day to ensure really fresh produce. Each morning any lettuce that is left from the previous day is sold to a dealer that resells it to farmers who use it to feed their animals. This week the supermarket can buy fresh lettuce for $10.00 a box. The lettuce is sold for $22.00 a box and the dealer that sells old lettuce is willing to pay $2.00 a box. Past his that tomorrow's demand for lettuce averages 270 boxes with a standard deviation of 44 boxes. How many boxes of lettuce should the supermarket purchase tomorrow? (Use Excel's NORMSINVO) function to find the Z-score. Round intermediate calculations to four decimal places. Round your answer to the nearest whole number.) Number of boxes