Instruction 14-8
the Number of Cases of Merlot Wine Sold

Instruction 14-8
The number of cases of merlot wine sold by a Barossa Valley Winery in an eight-year period follows.
$\begin{array}{cc}\text { Year } & \text { Cases of } \\& \text { Wine } \\2003 & 270 \\2004 & 356 \\2005 & 398 \\2006 & 456 \\2007 & 358 \\2008 & 500 \\2009 & 410 \\2010 & 376\end{array}$

-Referring to Instruction 14-8,construct a centred three-year moving average for the wine sales.