title: Counting Avg Number of Words Per Sentence
body: <p>I'm having a bit of trouble trying to count the number of words per sentence. For my case, I'm assuming sentences only end with either <code>"!"</code>, <code>"?"</code>, or <code>"."</code></p>
  
  <p>I have a list that looks like this:</p>
  
  <pre><code>["Hey, "!", "How", "are", "you", "?", "I", "would", "like", "a", "sandwich", "."]
  </code></pre>
  
  <p>For the example above, the calculation would be <code>1 + 3 + 5 / 3</code>. I'm having a hard time achieving this, though! Any ideas?</p>