NPC with Class & Racial Levels: What is Ability Score Adjustment?

[Ogrork the Mighty]

If an NPC has 2 racial hit dice and 7 class levels, does he gain +1 or +2 to ability score modifiers (as normal for level advancement at 4th and 8th levels)?

Does it matter if the class levels are NPC class levels?

[Lady-J]

they have 9 hit die so they get 2 ability score bumps, no it doesn't matter if they have npc class levels

[Lady-J]

they also get a +4,+4, +2,+2, +0, -2 in any order if they have any pc class levels

[Ogrork the Mighty]

Thanks!