Formula & Group test

In short
Formula Escale
Hi,

Great plugin congrats,

I am trying to get results as follow and need help:

If the total answers add up to max 40
in a scale from 1 to 5 (8 questions)

What i want to achieve is that the total result for that scale divided bynumber the number of questions,has to be between two numbers that come from the previous result, example: result of the scale: 28 divided by 8 has to be between 3,25 and 3.74 both included. (in this case is 3.50) so will meet the rule.

Also another question, it is possible that a group of people (a team) makes the test and then have the totals/final results of that group of people answering the test divided by the number of participants?

Thanks a lot