Question 13 Marks

Given that $\mathrm{r}=0.4, \sigma_{\mathrm{y}}=3, \sum\left(x_{\mathrm{i}}-\bar{x}\right)\left(y_{\mathrm{i}}-\bar{y}\right)=108, \sum\left(x_{\mathrm{i}}-\bar{x}\right)^2=900$. Find the number of pairs of observations.

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