How do you keep a running average of star ratings if you have multiple submissions?

I'll have about 4,000 people filling out multiple star rating forms and I'd like to have each form keep a running average for each star rating question (should be approximately 100 questions). 

I'm not sure how to find that average if it is built in.

I can see your question has been answered on another thread, here is the link: https://www.jotform.com/answers/887783 

Please take a look to the answer given by one of our Support Reps and reply there if you have questions, assisting you only in one thread will help us to avoid confusion and we will assist you better.

Thanks.