I am trying to figure out how to weigh scores based on participation rate.

Data:

4 groups of people (doesnt matter how many in each group) have the opportunity to take a test.

Each group varies in participation and average score.

Example:

__Group__.......

__Avg Score__.......

__Participation Rate__

Group1....... 1134............... 3%

Group2....... 1101............... 9%

Group3....... 1021............... 19%

Group4....... 1001............... 70%

Group5....... 998................. 89%

There should be a way to weigh the scores based on participation giving a more acurate "higher score"

Thanks in advance for any help