(a)[2]
Draw a cumulative frequency graph to show the data.
(b)[1]
Use your graph to estimate the 20th percentile of the data.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
For each of the 150 students, the time taken, $t$ minutes, to finish a puzzle was recorded. The results are summarised in the table.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Cumulative frequency graph drawn with at least 3 points plotted accurately at class upper end points, using linear scales and correct axes ranges.” …
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