National Scan Inc Sells Radio Frequency Inventory Tags Monthly Sales For A Seven 2

Quick! Please answer this question (highlighted parts) and show work. Esp. for naiive calculation. Thanks!

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National Scan Inc. sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows:MonthSales (000 units)Feb19Mar18Apr15May20Jun18Jul22Aug20a) Forecast September using a 5-month average =19.0015+20+18+22+20/5=19b) Forecast September using exponential smoothing with a smoothing constant equal to .20, assuming a March forecast = 19(000)MonthyForecastMarch1819Forecast now = Forecast previous + Alpha factor ( Actual prev – Forecast prev)Apr15May20Jun18Jul22Aug20Sepc) Forecast September using the naive approach =20