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AP® Calculus AB-BC

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Given Average Rate of Change, Identify the Interval

APCALC-EKMMZD

The function $f(x)=\ln x$ has an average rate of change equal to $\cfrac{3e}{e^3-1}$ on the interval $\left[\cfrac{1}{e},b \right]$ when $b=\underline{\hspace{2cm}}$

A

$e$

B

$\cfrac{1}{e}$

C

$\sqrt{e}$

D

$e^2$