title: python: finding the value of a random variable for a cdf
body: <p>I apologize in advance if this is poorly worded. </p>
  
  <p>If I have a stdDev = 1, mean = 0, <code>scipy.stats.cdf(-1, loc = 0, scale = 1)</code> will give me the probability that a normally distributed random variable will be <code>&lt;= -1</code>, and that is <code>0.15865525393145707</code>. </p>
  
  <p>Given 0.15865..., how do I find the value that gives me -1? </p>
  
  <p>i.e.  <code>value(cdf = 0.15865, loc = 0, scale = 1)</code> </p>
  
  <p>Thanks for the help. </p>