These are the ranks and amount of refs required to acheive a certain rank.
Journyman - 0-5 refs
Apprentice - 5-10 refs and 1 Task
Learner - 10-15 refs and 2 Task
Jedi in Traning - 15-20 refs and 3 Task
Dark Jedi or Jedi Knight - 20-30
Dark Jedi Master or Jedi Master - 30-50 refs
Dark Jedi Lord or Light Jedi Lord - me, 50+ refs, or complete 15 Task