A hospital receives regular shipments of liquefied oxygen, which it converts to oxygen gas that is used for life support. The company that sells the oxygen to the hospital wishes to forecast the amount of liquefied oxygen the hospital will use tomorrow. The number of liters of liquefied oxygen used by the hospital in each of the past 30 days is reported in the file oxygen.xlsx. (a) Using a moving average with N = 7, forecast tomorrow's demand. (b) Using single exponential smoothing with a = 0.1, forecast tomorrow's demand.