Sales of a New CD at a Store for the Last

Essay

Sales of a new CD at a store for the last 4 weeks are shown below. $\begin{array}{|l|c|c|c|c|}\hline \text { Week } & 1 & 2 & 3 & 4 \\\hline \text { Sales } & 112 & 105 & 125 & 118 \\\hline\end{array}$
a.Find a three-period moving average forecast for the next week.
b.Find a four-period moving average forecast for the next week.
c.Actual sales for week 5 were 105 units. What would be the three- and four-period moving average forecasts for week 6?