/**
* Get the right field name to fetch a stat for these attempts that is calculated for more than one $whichattempts (count or
* avg).
*
* @param string $field name of field
* @return int|float
*/
protected function get_field($field)
{
$fieldname = calculator::using_attempts_string_id($this->whichattempts) . $field;
return $this->{$fieldname};
}