123- What is the mean value of $f(x) = \dfrac{x^2 - 2}{x^2}$ on the interval $[2, 4]$? (1) $\dfrac{5}{8}$ (2) $\dfrac{11}{16}$ (3) $\dfrac{3}{4}$ (4) $\dfrac{7}{8}$
\textbf{123-} What is the mean value of $f(x) = \dfrac{x^2 - 2}{x^2}$ on the interval $[2, 4]$?
\hspace*{2cm} (1) $\dfrac{5}{8}$ \hspace{2cm} (2) $\dfrac{11}{16}$ \hspace{2cm} (3) $\dfrac{3}{4}$ \hspace{2cm} (4) $\dfrac{7}{8}$