Answer
$0$
Work Step by Step
The average is given by
$$
\frac{1}{1-(-1)} \int_{-1}^{1} x^{3} d x=\frac{1}{2} \int_{-1}^{1} x^{3} d x=\left.\frac{1}{8} x^{4}\right|_{-1} ^{1}=0.
$$
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