never
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When the data are qualitative. The mean and median are unusable in such cases and the mode is the only sensible measure.
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Mode is the only measure of central tendency to measure quantitative dataor qualitative data.
mode
The mode.
It is the mode, which is sometimes introduced, along with the mean and median as a measure of "central tendency".
Central tendency is measured by using the mean, median and mode of a set of numbers. Variation is measured by using the range, variance and standard deviation of a set of numbers.