Answer
a) $mean\gt median$
b) $mean\approx median$
c) $mean\lt median$
Work Step by Step
a) The tail to the right (some few large numbers) pulls the mean to the right too. The median is resistant, so it is only slightly affected.
b) The distribution is symmetric. In this case, the mean and median are approximately equal.
c) The tail to the left (some few small numbers) pulls the mean to the left too. The median is resistant, so it is only slightly affected.