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

The question is asking for a measure that is not considered a measure of central tendency. Measures of central tendency include the mean, median, and mode. These are all statistical measures that attempt to define the center of a data set. Other measures like range, variance, standard deviation, etc., are not measures of central tendency. They are measures of dispersion or variability in the data set. Therefore, without knowing the specific options, I can say that any measure that is not mean, median, or mode and instead measures dispersion or variability is not a measure of central tendency.