Wear your helmet! Many athletes and their parents) worry about the risk of concussions when playing sports. A football coach plans to obtain specially made helmets for his players that are designed to reduce the chance of getting a concussion. Here are the measurements of head circumference (in inches) for the players on the team: 23.0 21.7 22.0 22.3 22.6 22.7 21.5 20.8 23.0 24.2 23.5 20.8 24.0 22.7 22.7 22.2 25.6 22.6 22.5 22.5 21.9 21.0 22.4 23.9 23.9 23.1 21.6 23.5 23.4 23.3 a. Antawn, the team's starting quarterback, has a head circumference of 22.4 inches. What is Antawn's percentile?