If you are measuring the spread of data in a distribution,it is best to use the median in all formulas to avoid having a problem with extremes.

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The use of median or mean depends on the type of distribution and the presence of outliers. If the distribution is skewed or has extreme values, then the median is more appropriate. However, if the distribution is symmetrical and does not have outliers, then the mean can also be used. It is important to select the appropriate measure of central tendency based on the characteristics of the data.

If You Are Measuring the Spread of Data in a Distribution,it