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2nd quartile = 50th percentile = 5th decile = median . 1st decile = 10th percentile. 5.2 QUANTILES FOR UNGROUPED DATA. 5.2.1 Quartiles. To determine the quartiles, divide the distribution into four equal parts. 1st quartile: Q1 = score (25% of the scores fall below this value) 2nd quartile: Q2 = score or the median (50% of the scores fall below ... ................
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