Monthly Sales (In $1000s) of a Computer Store Are Shown

Essay

Monthly sales (in $1000s) of a computer store are shown below. $$\begin{array} { | l | c c c c c c | } \hline \text { Month } & \text { Jan } & \text { Feb } & \text { Mar } & \text { Apr } & \text { May } & \text { Jun } \\\hline \text { Sales } & 73 & 65 & 72 & 82 & 86 & 90 \\\hline\end{array}$$ a. Compute the three-month and five-month moving averages.
b. Compute the exponentially smoothed sales with w = 0.3 and w = 0.5
c. Calculate the four-month moving average, and four-month centred moving average.