[SOLVED] Show overall ratings and reviews

global $wpdb;
$pId = $post->ID; //if using in another page, use the ID of the post/page you want to show ratings for.
$row = $wpdb->get_results(“SELECT COUNT(*) AS total,AVG(review_rating) AS aggregate_rating,MAX(review_rating) AS max_rating FROM wp_wpcreviews WHERE page_id= $pId AND status=1″);
$max_rating = $row[0]->max_rating;
$aggregate_rating = $row[0]->aggregate_rating;
$total_reviews = $row[0]->total;
$totl = $aggregate_rating * 20;
$wpdb->flush();

For detail documentation, check this:
http://ka.lpe.sh/2012/10/22/wordpress-show-total-aggregate-ratings-and-reviews-to-your-posts-pages/

http://wordpress.org/extend/plugins/wp-customer-reviews/