original_string: public function stdDev(){
  		
  		Number::setScale(static::NUMERIC_FUNCTIONS_SCALE);
  		
  		$mean = $this->average();
  		$squares = new static();
  		
  		foreach($this->_Arr as $num){
  			$squares->add(Number::pow(Number::sub(\strval($num), $mean), '2'));
  		}
  		
  		return Number::sqrt($squares->average());
  		
  	}
code: public function stdDev(){
  		
  		Number::setScale(static::NUMERIC_FUNCTIONS_SCALE);
  		
  		$mean = $this->average();
  		$squares = new static();
  		
  		foreach($this->_Arr as $num){
  			$squares->add(Number::pow(Number::sub(\strval($num), $mean), '2'));
  		}
  		
  		return Number::sqrt($squares->average());
  		
  	}
code_tokens: public function stdDev ( ) { Number :: setScale ( static :: NUMERIC_FUNCTIONS_SCALE ) ; $ mean = $ this -> average ( ) ; $ squares = new static ( ) ; foreach ( $ this -> _Arr as $ num ) { $ squares -> add ( Number :: pow ( Number :: sub ( \ strval ( $ num ) , $ mean ) , '2' ) ) ; } return Number :: sqrt ( $ squares -> average ( ) ) ; }
docstring: Computes the population standard deviation for the numbers
  in this list
  @return string
docstring_tokens: Computes the population standard deviation for the numbers in this list