title: How to get the element-wise mean of an ndarray
body: <p>I'd like to calculate element-wise average of numpy ndarray.</p>
  
  <pre><code>In [56]: a = np.array([10, 20, 30])
  
  In [57]: b = np.array([30, 20, 20])
  
  In [58]: c = np.array([50, 20, 40])
  </code></pre>
  
  <p>What I want:</p>
  
  <pre><code>[30, 20, 30]
  </code></pre>
  
  <p>Is there any in-built function for this operation, other than vectorized sum and dividing? </p>