Which of the following is NOT a common measure of dispersion?

The median is a measure of central tendency that identifies the middle value in a data set when it's ordered from lowest to highest. It divides the data into two equal halves, providing insight into the data's central location rather than the spread or variability within the dataset.

In contrast, measures of dispersion are used to describe how spread out or varied the data points are around that central value. The range, standard deviation, and coefficient of variation are all established measures of dispersion. The range calculates the difference between the highest and lowest values, while standard deviation quantifies the average distance of each data point from the mean. The coefficient of variation provides a normalized measure of dispersion relative to the mean, expressed as a percentage.

Therefore, identifying the median as NOT being a measure of dispersion is accurate because it does not assess the variability of the data but rather focuses on its central point.