Information about the age of participants in a robotics competition is below: a box plot titled "age of participants" and labeled "age" uses a number line from 10 to 35 with primary markings and labels at 10, 15, 20, 25, 30, and 35. the box extends from 13 to 31 on the number line. a line in the box is at 16. the whiskers end at 11 and 33. the middle 50% of the data is between what two numbers?