With extreme difficulty, that is, you cannot.
The mode depends entirely upon the data items and the same mode can be found for different pairs of means and medians; similarly for any given pair of mean and median, there are many modes possible.
example:
The data sets {1, 1, 3, 4, 5, 6, 7, 8, 10}:
and {1, 2, 3, 4, 5, 6, 7, 7, 19}:
both have mean 6 and median 5, but the first has a mode of 1 and the second a mode of 7 - you cannot tell the mode from the mean and median.
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the median and mode are but the mean is not
The median is 9 and the mode is 18 and the mean is 11
Calculate the mean, median, and range with the outlier, and then again without the outlier. Then find the difference. Mode will be unaffected by an outlier.
mean: 1.7 median:1.7 mode: none
Mean, median, and mode are all equal in a normal distribution.