The answer depends on the type of data. The mean or median are useless if the data are qualitative (categoric): only the mode is any use. The median is better than the mean is the data are very skewed.
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Median
which measure best describes the data set
The mean may be a good measure but not if the data distribution is very skewed.
That depends on the data.
A pie graph represent data as a part of a whole, showing the separate portions of the data in accordance to the whole.