code: def RACC_calc(TOP, P, POP):
      
      try:
          result = (TOP * P) / ((POP) ** 2)
          return result
      except Exception:
          return "None"
docs: Calculate random accuracy.
  
      :param TOP: test outcome positive
      :type TOP : int
      :param P:  condition positive
      :type P : int
      :param POP: population
      :type POP:int
      :return: RACC as float