Suppose that the last four months of sales were 8, 10, 15, and 9 units, respectively. suppose further that the last four forecast were 9, 11, 8 and 12 units, respectively. what is the mean absolute deviation (mad) value of these forecast?

You are in the market for a new refrigerator for your company’s lounge, and you have narrowed the search down to two models. the energy efficient model sells for $700 and will save you $45 at the end of each of the next five years in electricity costs. the standard model has features similar to the energy efficient model but provides no future saving in electricity costs. it is priced at only $500. assuming your opportunity cost of funds is 6 percent, which refrigerator should you purchase