I had a quick look at this and couldn't see any easy way to do it with the data structured as you have it.
In the attached workbook I've "unpivotted" the data so you have one row per question per respondent. Note that on the detailed sheet I had to use table calculations to work out the overall averages.
BTW, I'd really recommend that you upgrade from 6.0 to 6.1 (or 7.0 shortly). I did the attached in 6.0 as you are still using that, but I had Tableau crash on me while I was doing the table calculations at the first attempt - there have been a lot of improvements since 6.0.
survey_dashboard_rl.twbx 26.6 KB