2. The local supermarket buys lettuce esch day to ensure really fresh produce. Each morning, any lettuce that is left from the previous day is sold to a denilet that resells it to farmers who use it to feed their animals. This week, the supermarket can buy freth lettuce for $4,00 a box. The teltuce 75 sotd for $10.00 a bor and the dealer that sells old letfuce is wiling to pay $1.50 a box. There is no disposal fee. Past history say that tomorrows demand for lettuce averagr? 300 boxes with a standard deviation ot 47 bowes. How mamy boses of letfuce should the wpermartet hurchse just for tomorrow