In today’s lesson, the focus was on calculating different types of averages, specifically the mean and median, using sets of data. An example was provided with James’ dart scores: 120, 71, 80, 2, 90, and 117, where students debated whether the mean or the median would best represent his average score. The discussion also involved identifying outliers in the data and concluded that the median was more suitable for datasets that contain outliers, as it provides a more accurate reflection of central tendency.