Please explain how to get the answers in red, especially part A.

6. We would like to evaluate the performance of Moving Average (3) and Exponential Smoothing (alpha=0.6) for the following weekly demand data: Blank columns are provided for your convenience. a) Develop forecast for Week 9 using MA(3) 260 b) Develop forecast for Week 9 using Exponential Smoothing (alpha=.6) 228.074 c) Which forecasting method is better? Explain why. MAD for MA(3)=57.6 MAD for Exp. Sm. =52.7 Exponential Smoothing with alpha=.6 is better because of the smaller MAD