There cannot be an outlier in a dataset that comprises only one number!
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An outlier is a number in a data set that is not around all the other numbers in the data. It will always affect the average; sometimes raising the average to a number higher than it should be, or lowering the average to something not reasonable. Example: Data Set - 2,2,3,5,6,1,4,9,31 Obviously 31 is the outlier. If you were to average these numbers it would be something greater than most of the numbers in your set due to the 31.
An outlier.
An outlier
No. The data set will remain the data set: they are the observations that are recorded.
The mean is changed.