Ideally all of these questions and answers would be child records (which provides much better reporting capabilities), but seeing as you just have the fields...
You will want to make 3 formula fields; # of Yes, # of No, # of N/A.
If the formula you use will be something to the affect of:
Sum(
If([Question 1]="Yes", 1, 0),
If([Question 2]="Yes", 1, 0),
If([Question 3]="Yes", 1, 0)
)
Repeat for all questions, then you can copy it and change the "Yes" to "No" and "N/A".
Now you will have numeric values that you can graph or count for your averages and totals.
