Quarterly Enrolments in a Business Statistics Class for Three Years

Quarterly enrolments in a business statistics class for three years are shown below. $$\begin{array} { | c | c c | } \hline \text { Year } & \text { Quarter } & \text { Enrolment } \\\hline 1996 & 1 & 26 \\& 2 & 29 \\& 3 & 33 \\& 4 & 18 \\1997 & 1 & 27 \\& 2 & 25 \\& 3 & 36 \\& 4 & 21 \\1998 & 1 & 32 \\& 2 & 36 \\& 3 & 39 \\& 4 & 30 \\\hline\end{array}$$ Compute the four-quarter centred moving averages.

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