Turnitin.com plagiarism percentage of 16%?

16% is the average I've been getting on my college papers. If its a book report or research paper, there are always going to be words that are used which can be found on other sources. Before she takes further action, ask to review your paper on turnitin.com and see what was exactly plagiarized. If the website notices 3 or more words which are in the same order as another source, it considers that plagiarism. Turnitin.com is a fail of a website to catch plagiarism. It takes common knowledge or words such as "once upon a time" as plagiarism. You have a legitimate claim. Fight it.