Here's one way to do this. I'm assuming that your questions are all different values of the same Question dimension, and that the answers have been reshaped. If that is not the case, then you'll need to do something different and I'd suggest posting a packaged workbook with some sample data.
1. Create a calculated field like:
IF AVG([Answer]) = WINDOW_MAX(AVG([Answer])) THEN "High Score"
ELSEIF AVG([Answer]) = WINDOW_MIN(AVG([Answer])) THEN "Low Score"
2. Put that field on the Color shelf. Then click on the blue pill on the Color shelf, and set your Compute Using to Table (Across) (or Question) to highlight by Group, and Table (Down) (or Group) to highlight by Question. I suggest you use the specific dimensions, that way the results won't be so subject to change if you bring other dimensions into the view.
If you wanted to make this user selectable, you could create two calculations like the above and set their Compute Using approprirately, then create a parameter to choose the dimension, then a calculated field that would return one or the other calc based on the parameter. That latter calculated field would be on the Color shelf. I created an example of this using the Coffee Chain DB in the attached workbook.
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