IB skill practice

Interpret box plots and cumulative frequency

Interpret quartiles, interquartile range, outlier boundaries, and distribution summaries.

Paper 2 6 marks Difficulty 2

Quartiles and outlier boundary

The ordered data set is \(11, 13, 15, 17, 20, 24, 28, 31, 35\). Find \(Q_1\), \(Q_3\), the interquartile range, and the upper outlier boundary.

Worked practice: quartiles and outliers

Read the quartiles, find the interquartile range, then calculate the upper outlier boundary.