Before revision: For example, when teaching the joint probability of two independent events, teachers often explain the abstract procedure (p1 * p2) first and illustrate this procedure with an example (e.g., throwing a dice twice).
After revision: For example, when teaching the joint probability of two independent events, teachers often explain the abstract procedure (p1 * p2) first and illustrate this procedure with an example (e.g., throwing a die twice).