They are statistical measures that are used, when appropriate, to summarise the central tendency of a set of data. That is, given a number of observations, these measures can give an indication of the value near which they all are.
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the median and mode are but the mean is not
The median is 9 and the mode is 18 and the mean is 11
mean: 1.7 median:1.7 mode: none
Mean, median, and mode are all equal in a normal distribution.
The median and mode cannot be outliers. For small samples a mode could be an outlier.