docs: def _set_medians_and_extremes(self):
          """
          Sets median values for rtt and the offset of result packets.
          """
  
          rtts = sorted([p.rtt for p in self.packets if p.rtt is not None])
          if rtts:
              self.rtt_min = rtts[0]
              self.rtt_max = rtts[-1]
              self.rtt_median = self.calculate_median(rtts)
  
          offsets = sorted(
              [p.offset for p in self.packets if p.offset is not None]
          )
          if offsets:
              self.offset_min = offsets[0]
              self.offset_max = offsets[-1]
              self.offset_median = self.calculate_median(offsets)