Answer
$16$
Work Step by Step
The average is given by
$$
\frac{1}{4-0} \int_{0}^{4} x^{3} d x=\frac{1}{4} \int_{0}^{4} x^{3} d x=\left.\frac{1}{16} x^{4}\right|_{0} ^{4}=16
$$
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