Question

Which statement below is incorrect? The mean is not affected by the existence of an outlier. The median is not affected by the existence of an outlier. The standard deviation is affected by the existence of an outlier. The interquartile range is unaffected by the existence of an outlier.

Answer 1

The mean is not affected by the existence of an outlier.

Answer 2

The correct answer, or incorrect statement, is A.  The mean is not affected by the existence of an outlier.