Weekly Toy Sales (In $1000s) in a Department Store for the Past

Essay

Weekly toy sales (in $1000s) in a department store for the past three months are shown below. $$\begin{array} { | c | c c | } \hline \text { Month } & \text { Week } & \text { Sales } \\\hline 1 & 1 & 14 \\& 2 & 22 \\& 3 & 20 \\ & 4 & 16 \\2& 1 & 18 \\& 2 & 20 \\& 3 & 24 \\& 4 & 20 \\3& 1 & 22 \\& 2 & 26 \\& 3 & 24 \\& 4 & 18 \\\hline\end{array}$$ Compute the four-week centred moving averages.