code: def avg_rate(self):
          
          if not self._has_data or 'sum' not in self.result['end']:
              return None
          bps = self.result['end']['sum']['bits_per_second']
          return bps / 8 / 1024 / 1024
docs: Average receiving rate in MB/s over the entire run.
  
          If the result is not from a success run, this property is None.