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Upper Quartile Definition. The Upper Quartile is the median of the upper half of a data set. This is located by dividing the data set with the median, and then dividing the upper half that remains with the median again, this median of the upper half being the upper quartile.esson Summary. The upper quartile of a data set, or Q3, is the median of the upper half of the data set. The term number of Q3 can be found using the formula. Once the term number is found with the formula, the term can then be located from the data set.
How to Calculate Upper Quartile. A quartile of a sorted data set is any of the three values that divide the data set into four equal parts; the upper quartile identifies the 1/4 of the population members that have the highest value.he upper quartile is 4.5, so the upper fourth of the population will only include members with a ranking higher than 4.5. Therefore, the upper fourth of this population will consist only of the fifth member using the method described in Step 3.