Effective XP range in dungeons

[Fhi]

Does anyone know if dungeons have the same "effective range" in order to get XP? If my guildmate run me through a big dungeon like, say, Pit of Saron, and I stay at the entrance, will I get XP from the last boss kill?

[Petraclese]

From the entrance no, but the boss is up on a platform that you can walk to and stand under to get credit.