Forecasting

Based on the information shown below,

Month Actual Demand

Jan $770$

Feb $820$

Mar $920$

Apr $880$

May $840$

Jun $905$

a$.$ Develop forecasts for March to July using a $2-$period weighted moving average model $($w$1=0\mathrm{.}80,$ w$2=0\mathrm{.}20).$