Comment Average

I recently bought and installed Ratings-Widget on my site, and I need to be able to show the average stars of all the comments on a post. For instance, this page:

https://www.eccrtest.com/kanger-subtank-plus-istick-30-watt-ecig-mod-review/

I have at the top a ‘Write a Review’ button, which opens into a comment form, that has your star ratings form. Down near the bottom of the page you’ll see the comments. I made three comments for now, ratings 5 stars, 0 stars, and 3 stars – so the average rating here would show a star rating above Write a Review of 3 Stars (5+3+0=8 / 3 = 2.6666667 or 3 Stars since we’d round up).

Is there a way to do this built in to the system? I tried out the shortcodes (one of which is currently displaying above my Write a Review box where I want the average ratings of all comments on the post to go.

Thanks so much in advance for any help you can provide! ??

-Ken