How do you find the average value of f(x)=1/x as x varies between [2,3]?

The average value of $f$ on $\left[a , b\right]$ is $\frac{1}{b - a} {\int}_{a}^{b} f \left(x\right) \mathrm{dx}$
$\frac{1}{3 - 2} {\int}_{2}^{3} \frac{1}{x} \mathrm{dx} = \ln \left(\frac{3}{2}\right)$