All Crit_resisit of mobs and bosses can be found here:
For example:
So: crit_resist NOT scale with mob/boss level at all.
also there are another formula for crit %:
Bosses(on ~200 levels) have average 50 crit_resist.
N=0.3 (for ex.)
on 200 level Hoplite_C3 with Finestra level 15 (DEX=128), CritChance = [(128+150)-50] * 0.3 = 68.4%