https://www.wowhead.com/tbc/guide/cl...stats-overview

You gain Critical Strike Chance at varying rates, depending on your class:
Paladins, Druids, and Shamans receive 1% Critical Strike Chance for every 25 points of Agility.
Rogues and Hunters receive 1% Critical Strike Chance for every 40 points of Agility.
Warriors receive 1% Critical Strike Chance for every 33 points of Agility.