Quartiles are statistical measures dividing a data set into four equal parts. Each quartile represents a rank order segment in the distribution of the data. The first quartile (Q1) represents the 25th percentile, the second quartile (Q2) or the median represents the 50th percentile, the third quartile (Q3) represents the 75th percentile, and the fourth quartile (Q4) represents the upper range of data.
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