Assessment Total Score Results

I am creating an assessment with several categories and results.  Each question is answered on a 4 point scale. a = 4, b = 3, c = 2, d = 1

I have a question on how the result % is calculated when you chose "Calculate results for: Selected results slides".  Does it give an average of each of the results slides or does it average all of the questions?  

Example: Section 1 (4 questions) 75%, Section 2 (2 questions) 100%, Section 3 (6 questions) 50% will the Total = 75% or the average of the % or will it equal 67% the average of all the individual answers?