In 1798, Henry Cavendish estimated the density of the earth by using a torsion balance. The "Cavendish" dataset contains his 29 measurements of the density of the earth, presented as a multiple of the density of water. The average measurement is 5.42, suggesting that the density of the earth is 5.42 times the density of water. However, a histogram or boxplot shows that the measurements are slightly skewed right with a low outlier. These slight departures from normality indicate that the median measurement, 5.46, is a better estimator of the earth's density than the mean.