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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.
The mean. Or the mode.
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To obtain a much better, simpler, and more practical understanding of the data distribution.
Yes, an observation that is abnormally larger or smaller than the rest of the data can significantly affect the mean, as it will pull the average towards that extreme value. However, the median and mode are less influenced by outliers, as they are not as sensitive to extreme values. The median is the middle value when the data is arranged in order, so outliers have less impact on its value. The mode is the most frequently occurring value, so unless the outlier is the most common value, it will not affect the mode.