Final answer:
A child believes in immanent justice during the concrete operational stage of Piagetian moral development, which typically occurs from ages 7 to 11.
Step-by-step explanation:
At the Piagetian stage of moral development when children believe in immanent justice, they are generally in the concrete operational stage. This stage typically occurs from ages 7 to 11 years old. During the concrete operational stage, children start to think logically about real events, understand conservation, and develop a basic understanding of rules and the consequences of actions. The belief in immanent justice is the idea that if someone does something wrong, there will be an immediate consequence, which is a way of enforcing the rules that they are beginning to understand.