Which of the following is not a measure of variability?

The median is a measure of central tendency rather than a measure of variability. It represents the middle value in a dataset when the values are arranged in order, thereby providing an indication of the center of the data distribution. Measures of variability, on the other hand, describe how spread out or dispersed the values in a dataset are.

The range, standard deviation, and variance are all measures of variability. The range provides the difference between the highest and lowest values, indicating the extent of the data spread. Standard deviation quantifies the amount of variation or dispersion of a set of values, reflecting how much individual data points diverge from the mean. Variance is the average of the squared differences from the mean, showcasing the degree of variability within the dataset. Thus, while the median gives insight into the center of the data, it does not inform us about the spread or variability of the values.