The stem-and-leaf plot lists the ages of customers in a bookstore. How many customers are 19 or younger? Enter your answer in the box. A stem-and-leaf plot with a stem value of 1 with a leaf value of 2, 2, 4, 5, 7, a stem value of 2 with a leaf value of 8, 9, a stem value of 3, a stem value of 4 with a leaf value of 0, 1, 4, 5, a stem value of 5 with a leaf value of 0, and a stem value of 6 with a leaf value of 9. Key: 1|2 means 12 the answer is 5