Answer
$\ln2$
Work Step by Step
$avg$ = $\frac{1}{2-1}$$\int_{{\,1}}^{{\,2}}$$\frac{1}{x}$ $dx$
$avg$ = $\ln(x)$ $|_{{\,1}}^{{\,2}}$
$avg$ = $[\ln2-\ln1]$
$avg$ = $\ln2$
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