Duration: 6:39

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Compute Karl Pearson's Coefficient of Correlation between sales and expenditures of a firm for six months.
\begin{tabular}{|l|r|r|r|r|r|r|}
\hline \( \begin{array}{l}\text { Sales } \\
\text { (in lakh of ₹) }\end{array} \) & 18 & 20 & 27 & 20 & 21 & 29 \\
\hline \( \begin{array}{l}\text { Expenditure } \\
\text { (in lakh of ₹) }\end{array} \) & 23 & 27 & 28 & 28 & 29 & 30 \\
\hline
\end{tabular}
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