code: public double getLowerBound(final int numStdDev, final int numSubsetEntries) {
      if (!isEstimationMode()) { return numSubsetEntries; }
      return BinomialBoundsN.getLowerBound(numSubsetEntries, getTheta(), numStdDev, isEmpty());
    }
docs: Gets the estimate of the lower bound of the true distinct population represented by the count
  of entries in a group.
  @param numStdDev
  <a href="{@docRoot}/resources/dictionary.html#numStdDev">See Number of Standard Deviations</a>
  @param numSubsetEntries number of entries for a chosen subset of the sketch.
  @return the estimate of the lower bound of the true distinct population represented by the count
  of entries in a group.