Learning goals: Teacher Facing Comprehend the words “mean” and “average” as a measure of center that summarizes the data using a single number. Explain (using words and other representations) how to calculate the mean for a numerical data set. Interpret diagrams that represent finding the mean as a process of leveling out the data to find a “fair share.” Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.8 Data Sets and Distributions, Grade 6.