Please help with question 4!

You are responsible for planning a fund raising for your company's charity and scholarship foundation. This year it involves a Super Bowl party at the local country club. This means that you need to estimate the amount of food to have and how many people you can serve. You know that in the past, an average of 820 people have showed up, each paying $40 to cover the food and beverage costs, as well as a donation to the scholarship fund. Examining the problem, you determine that the cost of the food and beverages averages $15.65 per person. You also estimate that the standard deviation of attendance (don't we all think this way) is about 135 people. Any food left over is given to a local food bank, earning an average of $1.25 in tax benefits. [1] Based upon this information, what service level should you use for planning? [2] Based upon this information, how many people should you plan for to attend the party? Show all of your calculations. [3] Write a paragraph-long explanation of your recommendation and the method that you used to calculate your recommendation. Be sure to explain the concept. [4] Instead of dealing with the uncertainty, what methods (at least two) could be used that would make this forecast more certain