Median
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median
A number does not have a quartile, a set of data does. The lower quartile of a set of data set is a value, in the data set, such that a quarter of the date set are smaller and three quarters are larger. The upper quartile is defined similarly. The middle quartile, better known as the median, divides the data set in two.
An average: Half of the sum of all numbers in a set of data .
A bisector divides an angle in half (usually in the form of a line passing through the centre of the angle).
The median is a measure of central tendency. In a set of data, it is the value such that half the observed values are larger and half are smaller.