Mathematics 4024 · O Level · Cumulative frequency diagrams
Cumulative frequency diagrams — practice question
The finishing times for $200$ runners in a $5$ km race were recorded, and the data are shown in the cumulative frequency diagram.
(a(i))[1]
Use the graph to estimate the median time.
(a(ii))[2]
Use the boxplot to estimate the interquartile range of the times.
(b)[1]
It was discovered that the times had been recorded inaccurately. Every correct time was one minute more than the recorded time. Write down the median and interquartile range of the correct times.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “27, cao” …