title: How to create normally distributed random numbers in PHP with given standard deviation(sigma)?
body: <p>I need normally distributed random numbers. Therefore I implemented the Polar Method like its mentioned here:</p>
  
  <p><a href="http://de.wikipedia.org/wiki/Polar-Methode" rel="nofollow noreferrer">Polar Method</a></p>
  
  <p>That's working good. But my problem is it only gives me standard normally distributed random numbers. But I also need some with another standard deviation(sigma).</p>
  
  <p>So I would need this generator to generate normally distributed random numbers with a given standard deviation(sigma). </p>
  
  <p>At the moment I am only able to create something like the blue one (standard):
  <a href="http://upload.wikimedia.org/wikipedia/commons/thumb/0/06/Normalverteilung.svg/350px-Normalverteilung.svg.png" rel="nofollow noreferrer">Graphics</a></p>
  
  <p>Is this possible?</p>