This post relates to the "a decaying gnome skeleton" that spawns in Ak`Anon. For an idea of their HPs, I randomly killed 10 of these from all over the zone (excluding the Mines of Malfunction which I will explain in a bit). One on one, strictly melee damage, went as follows:
1 - 20
2 - 20
3 - 17
4 - 18
5 - 16
6 - 16
7 - 18
8 - 19
9 - 20
10 - 17
So they have on average 20 HPs give or take a few.
I did not include ones that roamed around the Mines of Malfunction because as they roam by the high level NPC Necromancers they will buff them with, among others, a damage absorbtion shield that tops 200 HPs.
Edit: The ones that spawn in Steamfont Mountains have about 16-20 HPs on average also.
Edited, Thu Apr 27 12:37:33 2006