Definitions
- first quartile (designated Q1) = lower quartile = splits lowest 25% of data = 25th percentile
- second quartile (designated Q2) = median = cuts data set in half = 50th percentile
- third quartile (designated Q3) = upper quartile = splits highest 25% of data, or lowest 75% = 75th percentile
The difference between the upper and lower quartiles is called the interquartile range.
Read more about this topic: Quartile
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