docs: public Double getAvgDelayNumber() {
          Double avgDelayNumber = 0.0;
          if (items.size() != 0) {
              for (DelayStat item : items) {
                  avgDelayNumber += item.getDelayNumber();
              }
              avgDelayNumber = avgDelayNumber / items.size();
          }
          return avgDelayNumber;
      }