This Instructional Activity is a part of the Lesson 5, Unit 8, Grade 7. In this activity, students see how to approach such problems by estimating the probability of an event using the results from repeating trials. In this particular example, the exact probability can be computed when the information is revealed, so students can compare their results to this value. In situations like predicting the weather, estimates may be the best thing we have available. Students gain exposure to the process of drawing blocks from a bag, which will be useful in designing simulations in future lessons.