An outlier pulls the mean towards it. It does not affect the median and only affects the mode if the mode is itself the outlier.
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The mean. Or the mode.
The median and mode cannot be outliers. For small samples a mode could be an outlier.
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.
The mean is affected the most by an outlier.
The mean and median become smaller, the mode does not change.