It means they come out to the same number.
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They are identical in value.
By definition, an outlier will not have the same value as other data points in the dataset. So, the correct question is "What is the effect of an outlier on a dataset's mean." The answer is that the outlier moves the mean away from the value of the other 49 identical values. If the outlier is the "high tail" the mean is moved to a higher value. If the outlier is a "low tail" the mean is moved to a lower value.
The mean of a collection of identical numbers is always the identical number itself; in this instance, 12.
They are identical or equivalent.
two identical sides on a triangle