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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.
That would be outlier.
The outlier skews the mean towards it.
The outlier could affect the mean by making it drastically larger or smaller.
Outlier: an observation that is very different from the rest of the data.How does this affect the data: outliers affect data because it means that your calculations might be off which makes it a possibility that more than the outlier is off.