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 $3.00 a box. The lettuce is sold for $15.00 a box and the dealer that sells old lettuce is willing to pay $150 a box Past history says that tomorrow's demand for lettuce averages 250 boxes with a standard deviation of 34 boxes How many boxes of lettuce should the supermarket purchase tomorrow? (Use Excel's NORM.S.INVO function to find the z value. Round your answer to the nearest whole number.) Number of boxes