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Median
The
50th percentile.
- The median of a sample
of data is found by rank ordering the data from smallest to largest
value, then selecting the data value that is in the middle of the sample.
It will have an equal number of data values greater than it and less
than it. When there are an even number of data values, use the average
of the two central values.
- The median of a distribution
is determined as the 50th percentile point once the distribution has
been defined.
- For normal distributions,
the median value occurs at the average of the distribution. This is
also where the mode, or high point (most frequently occuring value),
of the distribution occurs.
- For distributions
skewed left, both the median and mode occur to the left of (are smaller
than) the distribution's average.
- For distributions
skewed right, both the median and mode occur to the right of (are larger
than) the distribution's average.
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