how do i respond to a class mate who posted this

A classic real world outlier is income. In a town where most households earn $45k-$70k, one athlete making $5 million will pull the mean up and make the community look richer than it is. The median barely changes, so it's a better measure of the \"typical\" case when outliers exist. Outliers also inflate the standard deviation and can distort regressions, skewing lines and predictions. Good practice is to visualize with boxplots. Importantly, outliers aren't always errors, they can reveal meaningful, exceptional cases worth separate analysis