This video has been created as part of the Probability section for the Year 9 course. I review the work which will have been covered in previous years. We look at what probability is. What it means to be a random experiment and the rest of the language which might be used in probability. I look at sample spaces and how these can be helped to find the probabilities of gaining certain events. There are a number of worked example and they are all explained in wonderful and engaging ways. This video follows the Cambridge Essentials series of textbooks with permission.