When the data are not numerical but can be ordered , the median may be used as a measure of central tendency.
Put the data in order and choose the middle value.
For example, low, medium,medium,low, high etc.
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Mode is the only measure of central tendency to measure quantitative dataor qualitative data.
The four measures of central tendency are mean-also called average, mode-the most frequently occurring numerical, median-the middle number after arranging all data from lowest to highest numerical and lastly standard deviation-root-mean-square or square-root of the variance. These are the 4 measure of central tendency.
You can use them to describe the central tendency of the data but no more than that.
Measurement Scale Best measure of the 'middle' Numerical mode Ordinal Median Interval Symmetrical data- mean skewed data median Ratio Symmetrical data- Mean skewed data median
mode