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.
$$\begin{array} { l c c c c } \text { Week } & 1 & 2 & 3 & 4 \\\text { Seles } & 112 & 105 & 125 & 118\end{array}$$
a.Find a 3 period moving average forecast for the next week.
b.Find a 4 period moving average forecast for the next week.
c.Actual sales for week 5 were 105 units. What would be the 3- and 4-period moving average forecasts for week 6?