showing avg rating using direct function call

gistfile1.php

/**
 * Show avg rating for multiple posts for same form id,
 * calls from shortcode or direct function call or from widget
 *
 * @param     $option
 * @param int $show_title
 * @param int $show_form_id
 * @param int $show_text
 * @param int $show_star
 * @param int $show_single
 * @param int $text_label
 *
 * @return string
 */

//function standaloneSinglePostRatingSummary($option, $show_title = 0, $show_form_id = 0, $show_text = 0, $show_star = 1, $show_single = 0 , $text_label = '')

//write this code in wordoress loop, if you don't understand what is loop in wordpress then please see it here https://codex.wordpress.org/The_Loop

if(function_exists('standaloneSinglePostRatingSummary')):
        global $post;  //if you are using this outside of wordpress loop then comment this
	$form_id = 1; //asign form id as you need. 
	$post_id = $post->ID; //if you are using this outside of wordpress loop then set the post id as it need , example $post_id = your post id here ;
        $option = array(
	    'form_id' => array($form_id),
	    'post_id' => array($post_id)
	);

	echo standaloneSinglePostRatingSummary($option);
endif;