Likelihood of Events: Certain, Uncertain, More and Less Likely

Grade 2 probability adds equally likely to the vocabulary, completing the comparative framework. Two events are equally likely when neither has more chance than the other: flipping a fair coin gives equal chances of heads and tails. Connecting probability to data is a new and powerful idea: if 8 out of 10 students prefer summer, the next student surveyed is more likely to prefer summer. Probability is not just about random events: it is about informed prediction from data.