Sample characteristics
Suppose a statistical series is given — a finite set of numbers (for example measurements or scores).
The sample mean (arithmetic mean xˉ): the sum of values divided by their count n.
The mode is the value that occurs more often than others (if there are several — one speaks of multimodality).
The median is a value that is not less than half the members of the series and not more than half; for the median the series is ordered; for even n one usually takes the mean of the two central values or states the rule explicitly.
The mean is sensitive to rare large outliers; the median is often more robust
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