Trudy has been training for an upcoming marathon. She has kept track of how many miles she runs every day for the past two weeks: 12, 15, 7, 14, 12, 3, 16, 15, 19, 20, 12, 9, 18, and
21. Trudy's coach says that he should be able to choose any day at random from the last
two weeks, and Trudy should have run more than 13 miles if she is to be ready for the
marathon. What is the probability her coach chooses a day from this list from the last two
weeks with more than 13 miles listed? Write your answer as a fraction.