\bagin{equation}
	\bar{x} = \frac{1}{8} * (5 + 10 + 15 + 20 + 30 + 50 + 80 + 100) ~ 38.75
\end{equation}

\begin{equation}
	\bar{y} = \frac{1}{8} * (3 + 8 + 12 + 22 + 25 + 55 + 80 + 90) ~ 36.875
\end{equation}

\begin{equation}
	r_x_y = \frac{(5 - 38.75)(3 - 36.875) + (10 - 38.75)(8 - 36.875) + (15 - 38.75)(12 - 36.875) + (20 - 38.75)(22 - 36.875) + (30 - 38.75)(25 - 36.875) + (50 - 38.75)(55 - 36.875) + (80 - 38.75)(80 - 36.875) + (100 - 38.75)(90 - 36.875)}{\sqrt{(5 - 38.75)^2 + (10 - 38.75)^2 + (15 - 38.75)^2 + (20 - 38.75)^2 + (30 - 38.75)^2 + (50 - 38.75)^2 + (80 - 38.75)^2 + (100 - 38.75)^2}\sqrt{(3 - 36.875)^2 + (8 - 36.875)^2 + (12 - 36.875)^2 + (22 - 36.875)^2 + (25 - 36.875)^2 + (55 - 36.875)^2 + (80 - 36.875)^2 + (90 - 36.875)^2}} = \frac{8183.75}{89.29 * 92.39} = 0.99
\end{equation}