Best way to show the meaning of a score in a chart?

I have charts that display calculated progress. What I want to be able to do, is given a result, show whether that score falls in the Average,Above Average,Below Average or Excellent. What would be the best way to do this ? Charts take values 1-10.

1-2 is Below Average

3-5-Average

4-7- Above Average

7-10- Excellent

Do I put the chart color in a different intensitiy, lighter being below average and with full intensity being Excellent ? This is what it looks like now : enter image description here

Every chart gets filled a color depending on the number. But what would be the best way to give the numbers a meaning ?

Thank you in advance!

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