Find quartiles and interquartile range
The ordered data set is \(8, 10, 12, 15, 18, 22, 24, 26, 30\). 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.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.