Answer
(a) -> IV
(b) -> III
(c) -> II
(d) -> I
Work Step by Step
(a) and (d) are symmetric. So, $mean\approx median$. But, in (d) the values of the random variable are larger than in (a). We can conclude that: (a) -> IV and (d) -> I
In (b) tail is to the right. So, $mean\gt median$. We can conclude that: (b) -> III
In (c) tail is to the left. So, $mean\lt median$. We can conclude that: (c) -> II
