The mode is a statistical term for the value that occurs most frequently in a set of numbers. Learn about the difference between the mean, median, and mode.

The mean is the mathematical average of two or more numbers. Find out how investors and economists use the mean to track performance.

Learn how to calculate the interquartile range from a variety of different data types and draw and interpret box-and-whisker diagrams.

The median income for Americans 65 and older is $54,710. The mean (average) is $83,950 Average annual expenditures for Americans 65 and older are $60,087. The average Social Security retirement ...