Which of the following is NOT a measure of central tendency?

The standard deviation is indeed not a measure of central tendency; instead, it is a measure of variability or dispersion within a data set. Measures of central tendency, such as the mean, mode, and median, are all used to describe the center or typical value of a data set.

The mean is the average value obtained by adding all the numbers and dividing by the total count. The mode denotes the most frequently occurring value in a data set, while the median represents the middle value when the data is arranged in ascending or descending order. In contrast, the standard deviation quantifies how much the values in a set deviate from the mean, providing insight into the spread of the data rather than its central value. This distinction clarifies why the standard deviation is not classified as a measure of central tendency.