title: Kurtosis of a normal distribution
body: <p>According to what I read from <a href="http://mathworld.wolfram.com/Kurtosis.html" rel="nofollow">here</a>, the kurtosis of a normal distribution should be around 3. However, when I use the kurtosis function provided by MATLAB, I could not verify it:</p>
  
  <pre><code>data1 = randn(1,20000);
  v1 = kurtosis(data1)
  </code></pre>
  
  <p>It seems that the kurtosis of a normal distribution is around 0. I was wondering what's wrong with it. Thanks!</p>
  
  <p><strong>EDIT</strong>
    I am using MATLAB 2012b. </p>