Using three examples with "range from"

Solution 1:

A range extends from one point to another. It is possible to express the extent between the two end points, as in your first example, but there is no reason why intermediate points cannot be included, as in your second example.

Solution 2:

Range has a slightly different meaning in the two cases.

• The first case is about a range of values, from one limit/extreme to another.

• The second, which I would express using "range among juniors, seniors, and graduates" is about an enumeration: any of the indicated values is a candidate.

In the second case, the enumeration could be understood as exhaustive (only juniors, seniors, and graduates) or it could be understood as indicative/exemplary (candidates include juniors, seniors, and graduates - and possibly others). Context should disambiguate, if only one meaning is intended.

Some might argue that "among" implies only. That's certainly one strong meaning, so "range among" has a fairly strong connotation of only these. But without further clarification it does leave open the possibility that there are other values that are also candidates.