(a)[2]
Use the cumulative frequency graph to estimate the interquartile range.
(b)[2]
Use the cumulative frequency graph to estimate the number of students who needed more than 50 minutes to finish the homework.
Mathematics 0580 · IGCSE · Cumulative frequency diagrams
Cumulative frequency diagrams — practice question
The cumulative frequency graph gives data on the time, $m$ minutes, that 120 students needed to finish some homework.