title: How to average a value list in a dictionary
body: <p>How can you average the value in a dictionary if it's a list?
  What follows is the code I have with the correct answer.
  I cannot use slicing techniques</p>
  <pre><code>dict = {'zy': [1.0, 0.9, 0.8, 0.7]}
  # code to average the values
  print(dict)
  {'zy': 0.85}
  </code></pre>