An outlier sits far from the rest of the data. It pulls the mean more than the median. Mean, median, and mode are in mean, median, and mode.
Far from the cloud or the box
On a scatterplot it is a lone point, in scatterplots. On a box plot it sits past the whisker. The IQR is the middle fifty percent, in IQR.
Box plots as a set are in box plots.
The bottom line
Far from the rest: outlier. Mean moves. Median mostly stays.
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