What is a passing grade on the FE exam?

NCEES does not publish passing grades for the FE exam. 

The passing grade changes each time a new exam is introduced or the exam specifications change. The passing grade results from a team who examines the exam and determines the minimal score to achieve competence in the subject matter.

There are no predetermined percentages of how many examinees will pass and how many will fail. It is solely based off achieving the predetermined passing grade.