title: Calculating overall rating
body: <p>If i have a series of 10 objects with rating from 1 to 10. Then how can i calculate overall rating? </p>
  
  <p>For example if i have a list like this:</p>
  
  <pre><code>Entertainment - 8/10
  Fun - 9/10
  Comedy - 6/10
  Dance - 8/10
  </code></pre>
  
  <p>and so on... Like this 10 objects. Tell me how to calculate the overall rating for 10.</p>
  
  <pre><code>Overall - ?/10
  </code></pre>
  
  <p>I am very weak in maths. I was told by someone to add the total and if I got 83 as the answer, then the overall rating will be 8.3/10. Is this correct?</p>
  
  <p>I am doing this for my PHP website. So if someone knows how to write a query for this, that would be very helpful for me.</p>