title: Weighted averaging a list
body: <p>Thanks for your responses. Yes, I was looking for the weighted average.</p>
  
  <pre><code>rate = [14.424, 14.421, 14.417, 14.413, 14.41]
  
  amount = [3058.0, 8826.0, 56705.0, 30657.0, 12984.0]
  </code></pre>
  
  <p>I want the weighted average of the top list based on each item of the bottom list.</p>
  
  <p>So, if the first bottom-list item is small (such as 3,058 compared to the total 112,230), then the first top-list item should have less of an effect on the top-list average.</p>
  
  <p>Here is some of what I have tried. It gives me an answer that looks right, but I am not sure if it follows what I am looking for.</p>
  
  <pre><code>for g in range(len(rate)):
      rate[g] = rate[g] * (amount[g] / sum(amount))
  rate = sum(rate)
  </code></pre>
  
  <p>EDIT:
  After comparing other responses with my code, I decided to use the zip code to keep it as short as possible.</p>