Measures of Position for Ungrouped Data The Quartile The quartiles are the score points which divide a distribution into four equal parts. Twenty-five (25%) of the distribution falls below the first quartile, fifty percent (50%) are below the second quartiles and seventy-five percent (75%) falls below the third quartile. Since the second quartile is equal to the median, the steps in the computation of median by identifying the median class is the same as identifying the Q. class and the Q: class. a. 25% of the data has a value ≤ Q₁ b. 50% of the data has a value S M or Qz c. 75% of the data has a value ≤ Q​