The answer will depend on the nature of the data.
The median.
The mean.
you need to be more specific with your question!!
never * * * * * When the data are qualitative. The mean and median are unusable in such cases and the mode is the only sensible measure.
the median is perferred when the data is strongly skewed or has outliers. =)
The median.
by getting the mean and multiply by the median
The mode.
The mean may be a good measure but not if the data distribution is very skewed.
The mean.
Median
mean
The mode.
you need to be more specific with your question!!
If you want to ask questions about "this situation", then I suggest that you make sure that there is some information about the situation in the question.
never * * * * * When the data are qualitative. The mean and median are unusable in such cases and the mode is the only sensible measure.
Its the one most commonly used but outliers can seriously distort the mean.