Calculate the covariance of the following bivariate data: \begin{ta...

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Calculate the covariance of the following bivariate data:
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline\( X \) & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \\
\hline\( Y \) & 78 & 72 & 66 & 60 & 54 & 48 & 42 & 36 & 30 & 24 & 18 & 12 \\
\hline
\end{tabular}
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