class NormalDistribution implements ProbabilityDistribution<Double> {

  @Override
  public double getCDF(final Double x) {
    Validate.notNull(x);
    return DERFC.getErfc(-x / ROOT2) / 2;
  }

  public  NormalDistribution(final double mean, final double standardDeviation);
  public  NormalDistribution(final double mean, final double standardDeviation, final RandomEngine randomEngine);

}