\begin{equation}
(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) = 8183.75
\end{equation}

\begin{equation}
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} = 92.39
\end{equation}

\begin{equation}
\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} = 89.29
\end{equation}

\begin{equation}
\frac{8183.75}{89.29 * 92.39} = 0.992
\end{equation}