a stem and leaf plot
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A normal distribution is symmetrical; the mean, median and mode are all the same, on the line of symmetry (middle) of the graph.
The median would not change, but the mean would increase.
That would provide some evidence that the distribution is symmetric about the mean (or median).
The mean deviation from the median is equal to the mean minus the median.
An outlier will pull the mean and median towards itself. The extent to which the mean is affected will depend on the number of observations as well as the magnitude of the outlier. The median will change by a half-step.