The heights of 10 students are listed individually: 12, 15, 18, 14, 17, 13, 16, 19, 15, 14. The students are asked to find the 2nd quartile (Q2) of the data., Students organize data that is not listed individually but summarized into class intervals, so they can calculate the quartiles (Q1, Q2, Q3)., The teacher presents data arranged in class intervals or ranges and asks students to identify the quartiles using the grouped data formula., A teacher grouped students’ ages: 10–11 (3), 12–13 (5), 14–15 (4). She asks the students to calculate Q3 to determine the age above which 75% of the students fall., A teacher recorded her students’ quiz scores individually: 5, 7, 8, 9, 10, 11, 12, 13, 14. She asks the students to calculate Q1 directly from the data.

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