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The CFAI actually has guidelines on how MPS is established. You can find the info on the bottom of this page: http://www.cfainstitute.org/programs/cfaprogram/exams/Pages/cfa_exam_results.aspx
I’ve heard 65% from Schweser profs as well. That seems about right to me, but @RoyD is right that it changes for each exam based on the factors you can read about above. I wouldn’t put too much effort into figuring the mechanics out though. I feel like most candidates freak out about the MPS because they’re scoring right around 70% on the mocks, which means being in the fail zone is very possible. The reality though is that even if you knew the MPS ex-ante it wouldn’t actually help you pass. Just focus on crushing it and not worrying about anything but the vignette at hand during the exam.
Good luck everyone, and may the MPS be ever in your favor.