code: public void accumulateResults(BenchmarkReport benchmarkReport) {
          determineTotalsAndAverages();
          standardDeviationDoubles = StatisticUtils.determineStandardDeviationDoubles(singleBenchmarkResultList, averageScore, getSuccessCount());
      }
docs: Does not call {@link SingleBenchmarkResult#accumulateResults(BenchmarkReport)},
  because {@link PlannerBenchmarkResult#accumulateResults(BenchmarkReport)} does that already on
  {@link PlannerBenchmarkResult#getUnifiedProblemBenchmarkResultList()}.
  @param benchmarkReport never null