Illuminate\Database\Query\Builder::avg PHP Method

    public function avg($column)
    {
        return $this->aggregate(__FUNCTION__, [$column]);
    }

 /**
  * Retrieve the average of the values of a given column.
  *
  * @param string $column
  * @return float|int 
  * @static 
  */
 public static function avg($column)
 {
     return \Illuminate\Database\Query\Builder::avg($column);
 }