Mean, median and mode

These three measures summarize a data set and help explain its behavior.

Mean

The mean is the average. Add all values and divide by the number of values.

Example: data 2, 4, 4, 6, 9. The mean is (2+4+4+6+9)/5 = 5.

Median

The median is the middle value when data is ordered.

Mode

The mode is the value that appears most often. In 2, 4, 4, 6, 9 the mode is 4.