Honour's classification question

This is from the handbook for my course:
"

Final awards – Honours classification
Calculation of overall classification grade for Honours classification(Bachelor’s Degree)
NOTE: (Throughout sections D6 and D7 the word ‘average’ shall be read as ‘arithmetical mean’.)
The Programme Board of Examiners will determine for each candidate: the average numeric grade of the best 90 credits at Level 6 or higher and the average numeric grade of the best remaining 30 credits at Level 5 or higher;a combined numeric grade from a weighted average of (i) and (ii) (that is, 75% (i): 25% (ii)); the candidate’s Honours classification will be considered on the basis of this combined average numeric grade."

Does this basically mean that only the average of your best grades from level 6 and level 5 are used to determine your honours classification?