Based off the schema at http://schema.org/AggregateRating adding rating numbers to your wordpress posts is a matter of changing the field ‘Ratings Vote Text:‘ on the Ratings Templates admin page to:

<div itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating" style='display:inline;'>
%RATINGS_IMAGES_VOTE%
(<strong itemprop="reviewCount">%RATINGS_USERS%</strong> votes, average:
<strong itemprop="ratingValue">%RATINGS_AVERAGE%</strong> out of
<span itemprop="bestRating">%RATINGS_MAX%</span>)<br />%RATINGS_TEXT%
</div>

Once this is loaded use Google’s rich text snippet checking tool at http://www.google.com/webmasters/tools/richsnippets to test it… Read the rest