This Instructional Activity is a part of the Lesson 10, Unit 5, Grade 7. Students read the paragraphs silently. In previous lessons, you estimated probabilities of events by collecting data empirically or by establishing a theoretical probability model. There are real problems for which those methods may be difficult or not practical to use. Simulation is a procedure that will allow you to answer questions about real problems by running experiments that closely resemble the real situation. It is often important to know the probabilities of real-life events that may not have known theoretical probabilities.