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

• A. Mean
• B. Median
• C. Mode
• D. Standard Deviation

Answer: (D)

Central tendency is about where data tend to cluster, giving a single representative value of a data set. The mean, median, and mode all describe that central location: the mean is the average value, the median is the middle value when data are ordered, and the mode is the most frequent value. The standard deviation, however, describes how spread out the data are around that central value. It measures dispersion, not the location of the center. So it’s not a measure of central tendency.