Which of the following summary measures is affected most by outliers?
A. The geometric mean
B. The interquartile range
C. The range
D. The median
E. All of the above

The Empirical Rule states that the approximate percentage of measurements in a data set (providing that the data set has a bell-shaped distribution) that fall within two standard deviations of their mean is approximately:
A. 95%
B. 99%
C. 68%
D. 75%