(a)[4]
In the grid below, draw a cumulative frequency graph to show this information.
(b)[2]
$38\%$ of these leaves have a length of $k$ cm or more. Use your graph to estimate $k$.
(c)[3]
Calculate an estimated mean length for these $250$ leaves.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
For a particular plant species, the lengths of $250$ leaves are measured to the nearest centimetre. The findings are shown in the table below: Length (cm): $5$-$9$, $10$-$14$, $15$-$19$, $20$-$24$, $25$-$29$, $30$-$39$ with matching frequencies $18$, $28$, $60$, $72$, $48$, $24$.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “At least four cumulative frequencies are worked out correctly from the data.” …
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