Answer
$30,292 \ mi$
Work Step by Step
The mean measurement is given by
$$
\frac{1}{6}(
25,740 \ mi+ 32,160\ mi+41,005 \ mi+
21,612\ mi+ 35,424 \ mi+ 25,810\ mi
)
= 30,291.833 \ mi\approx 30,292 \ mi
.$$
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