def sort_scores(scores):
    """
    Purpose: Sorts the score's list based on the participant's overall score.
    Example: [['Eric Simon', '4.00', 4, 5, 3], 
              ['Robert Chen', '9.00', 10, 9, 8], 
              ['GiantUnicorn', '2.00', 1, 2, 3]] 
             becomes 
             [['Robert Chen', '9.00', 10, 9, 8], 
              ['Eric Simon', '4.00', 4, 5, 3], 
              ['GiantUnicorn', '2.00', 1, 2, 3]] 
    """
    scores.sort(key = lambda x: x[1], reverse = True) 
    return scores