public function variance()
    {
        $float_variance = pow($this->float_sigma, 2);

        if ($this->int_precision) {
            return round($float_variance, $this->int_precision);
        }

        return $float_variance;
    }
public function variance()
    {
        $float_variance = pow($this->float_sigma, 2);

        if ($this->int_precision) {
            return round($float_variance, $this->int_precision);
        }

        return $float_variance;
    }
public function variance ( ) { $ float_variance = pow ( $ this -> float_sigma , 2 ) ; if ( $ this -> int_precision ) { return round ( $ float_variance , $ this -> int_precision ) ; } return $ float_variance ; }
Compute the variance and return the result.

@see NormalDistribution::precision()
@access public
@return float
Compute the variance and return the result .