Final answer:
A representative behavior of a school-age child (age 5 to 12 years) is participating in sports or other peer-group activities.
Step-by-step explanation:
A representative behavior of a school-age child (age 5 to 12 years) is participating in sports or other peer-group activities. At this age, children compare themselves to their peers, and peer acceptance becomes increasingly important. Engaging in group activities such as sports allows them to interact with their peers, develop social skills, and form relationships.