text: from Statistics.Proportion import proportion
  from Calculators.Subtraction import subtraction
  from Calculators.Division import division
  from Calculators.Multiplication import multiplication
  
  
  def var_pop_proportion(data):
      p = proportion(data)
      q = subtraction(1, p)
      n = len(data)
      return division(n, multiplication(p, q))
  