template-home.php

<?php

      $args = array(
        'post_type' => 'review',
        'post_status' => 'publish',
        'posts_per_page' => '-1',
        'orderby' => 'ID',
        'order' => 'DESC',
      );

      $limit = 5;
      $limit_count = 0;
      $ratings = array();
      $reviews = array();

      query_posts( $args );

      while ( have_posts() ) : the_post();
        if ($limit_count < 5) {
          $reviews[] = array(
            "reviewed_by" => get_field('reviewed_by', $post->ID),
            "reviewed_from" => get_field('reviewed_from', $post->ID),
            "content" => $post->post_content
          );
          $limit++;
        }
        $ratings[] = get_field('reviewed_rating', $post->ID);
      endwhile;

      $ratings_total = array_sum($ratings);
      $ratings_count = count($ratings);
      $average_rating = number_format(($ratings_total / $ratings_count), 1, '.', '');
    ?>