Category Average

I did something like this:

   // Set up an empty array to store average rating for each entry 
    // Run a WP query for entries in this category and find its average rating
    $cat_avg_rating = array();
    $cat_query = new WP_Query( array (
        'posts_per_page' => -1,
        'post_status'    => 'publish',
        'cat' => 1234,
    ));
    if ( $cat_query->have_posts() ) : 
        while ( $cat_query->have_posts() ) : $cat_query->the_post(); 
            $cat_avg_rating[] = get_post_meta( get_the_ID(), 'ratings_average', true );
        endwhile; wp_reset_postdata();
    endif;
    // Remove empty vals and calculate average
    $cat_avg_rating = array_filter($cat_avg_rating, function($x) { return $x !== ''; });
    $average = array_sum($cat_avg_rating) / count($cat_avg_rating);
    echo $average;