title: Using a for loop to calculate the average
body: <p>Hi I'm sort of new to programming and I would really appreciate some help with this problem.</p>
  
  <p>I have a list of scores and I would like to create a function which divides each individual score by the calculated average of the whole list. The function should accept a list of scores as an argument and return a list with the modified scores. 
  Also, it should make use of a for loop and a return statement.
  Here is a brief example of the list of scores I have:
  13
  22
  33
  42
  25
  (there are over 500 scores) </p>