Offhand, I do not know how to easily derive the range from looking at
default attribute values, since there are a lot of factors in play. It
also depends on how you define "range".
Although the example code may be a little stale, i suggest reading Joe
Kopena's example where he studied this problem:
http://www.nsnam.org/wiki/index.php/Statistical_Framework_for_Network_Simulation#Example