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mean
The mean is better than the median when there are outliers.
Its the one most commonly used but outliers can seriously distort the mean.
Having only the mean is not sufficient to identify outliers. You need some measure of dispersion.
Helps you accurately measure the results of a population. It's simply the middle number in a data set, so half of the population is above and half of it is below. It is better than the mean since it is resistant to outliers.