code: def normal_quantile(p, mean=0, std=1):
      """
      Calculate normal distribution quantile.
  
      :param p: probability
      :type p: float
      :param mean: mean
      :type mean: float
      :param std: standard deviation
      :type std: float
      :return: normal distribution quantile as float
      """
      try:
          return mean + std * math.sqrt(2) * inv_erf((2 * p) - 1)
      except Exception:
          return "None"
  
imports: from __future__ import division
  import sys
  import math
  import numpy
  import re
  from .pycm_param import *
  from .pycm_error import pycmMatrixError
  from warnings import warn
  from functools import wraps
label_desc: Use image node_id 29 for calling a global function with example usage: normal_quantile(p, mean, std) and returns: unknown, str