Calculate Star rating based on webform submissions Is there a module to calculate Average Vote based on webform submissions?

Explanations:

I have a Webform which looks like this. So when a user submits the form i need a average value to be calculated which i can show as star rating some where on another page. 



Does it need a custom module ? 

Any clues ?
thanks
Yes. You should create a fivestar field in your webform and than create a custom module which calculate the rating and save it to a fivestar field.