code: @Override
      public double calculateAnomalyScore(double value) {
          double zScore = (value - mean) / Math.sqrt(variance);
          //Taking absolute value for a more human-readable anomaly score
          return Math.abs(zScore);
      }
docs: Calculates the z-score of the data point, which measures how many
  standard deviations the data point is away from the mean.
  
  @param value the value of the data point
  @return the absolute value of the z-score of the data point