Free PMI Project Management Professional Practice Question

The correct answer is Day 8. To calculate the Early Finish (EF) of an activity, we use the formula: EF = ES + Duration - 1. In this case, ES = 5 and Duration = 4. Therefore, EF = 5 + 4 - 1 = 8. It's important to note that we subtract 1 from the result because the activity starts on Day 5 and finishes at the end of Day 8, which is a total of 4 days. If we didn't subtract 1, we would incorrectly count 5 days instead of 4. This calculation is essential for determining the earliest time an activity can be completed, which is crucial for identifying the critical path and managing the project schedule effectively.