From the following table, calculate the Karl Pearson's coefficient ...

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From the following table, calculate the Karl Pearson's coefficient of correlation.
\begin{tabular}{|c|c|c|c|c|c|}
\hline \( \mathrm{X} \) & 6 & 2 & 10 & 4 & 8 \\
\hline \( \mathrm{Y} \) & 9 & 11 & \( ? \) & 8 & 7 \\
\hline
\end{tabular}
Arithmetic means of \( X \) and \( Y \) series are 6 and 8 respectively.
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