Ok so I took an exam, and they said I got a 53% on it, but when I add up all the percentages and divide by the number of categories, I get a 57% (55% is passing). So can someone tell me what the total percentage (score) of all these categories are? I know this is elementry but I just want to double check before I call them

These are each of the sections of the exam and what I scored:

1) 75%

2) 53%

3) 50%

4) 50%

5) 20%

6) 100%

7) 50%

8) 75%

9) 0%

10) 100%

Thank you so much for the help!