text: """
    Name     : c13_68_norm_ppf.py
    Book     : Python for Finance
    Publisher: Packt Publishing Ltd. 
    Author   : Yuxing Yan
    Date     : 2/27/2017
    email    : yany@canisius.edu
               paulyxy@hotmail.com
  """
  
  import scipy.stats as stats
  #
  cumulativeProb=0
  print(stats.norm.ppf(cumulativeProb))
  #
  cumulativeProb=0.5
  print(stats.norm.ppf(cumulativeProb))
  #
  cumulativeProb=0.99
  print(stats.norm.ppf(cumulativeProb))
  
  