Assuming you're recording each score as an attribute, and if you have a finite number of possible scores, you could go ahead and create this (list all score attributes, and set them all to 0 until they're filled by someone playing, and divide by the total number of scores).
Maybe you should know wich scores have a value before dividing to get a more precise average function.
if you make an integer attribute and a rule for every score adding 1 to the initial attribute if they are different than 0 you'll get a perfect divider.
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Display text: ((score1)+(score2)+(score3))/3
Assuming you're recording each score as an attribute, and if you have a finite number of possible scores, you could go ahead and create this (list all score attributes, and set them all to 0 until they're filled by someone playing, and divide by the total number of scores).
Hope that helps!
if you make an integer attribute and a rule for every score adding 1 to the initial attribute if they are different than 0 you'll get a perfect divider.
Always thinking of finite scores.