an outlier can be found with this formula...
Q3-Q1= IQR( inner quartile range)
IQR*1.5=x
x+Q3= anything higher than this # is an outlier
Q1-x= anything smaller than this # is an outlier
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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.
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 median and mode cannot be outliers. For small samples a mode could be an outlier.
The mean is better than the median when there are outliers.
The mean is affected the most by an outlier.