Answer
$Mean=3499~km$
$Median=3453~km$
Work Step by Step
Distances in ascending oreder:
3278, 3391, 3427, 3453, 3593, 3662, 3687
$Mean=\frac{3278+3391+3427+3453+3593+3662+3687}{7}=3499$
There are 7 observations (odd). The median is the value of the fourth observation.
$Median=3453$
