Effects of an Outlier on Mean, Median, Mode, and Range

This worksheet helps reinforce the effect of an outlier on the mean, median, mode, and range of a data set. Six data sets are provided. Students must calculate the mean, median, mode, and range of each data set with the outlier included, then with the outlier excluded. They must then determine what effect the outlier has on these statistics when included in the data set. A complete answer key is also provided.