Students compare measures of center, standard deviation, and the IQR for different data sets. This lesson provides opportunities for students to collaborate, share mathematical ideas, and reflect on their mathematical thinking about measures of center and measures of variability. This lesson also gives students another opportunity to compare measures of center and variability, but now using standard deviation and outliers in the comparisons. When students are describing measures of center and measures of variability in the context of marathon time they are reasoning abstractly and quantitatively (MP2) because they are interpreting the meaning of their answer in context.