code: public function get_movie_rating( $votes ) {
  
  		$votations = [];
  
  		foreach ( $votes as $key => $value ) {
  			for ( $i = 0; $i < $value; $i++ ) {
  				$votations[] = $key;
  			}
  		}
  
  		if ( count( $votations ) ) {
  			$rating = array_sum( $votations ) / count( $votations );
  			return round( $rating, 1 );
  		}
  
  		return 'N/A';
  	}
docs: Calculate rating.
  
  @since 1.0.1
  
  @param array $votes → votes number.
  
  @return int|float|string → rating