The median
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Another name for second quartile, Q2, is median. It is also sometimes referred to as P50.
The lower quartile is the second smallest and the upper quartile is the fourth smallest (second largest).
What is coefficient of quartile deviation?
In a data sample, the purpose of quartile deviation is a way to measure data dispersion instead of using the range. The quartile deviation is found by subtracting the lower quartile from the upper quartile, and dividing this result by two.
Interquartile Range, or IQR