(i)[3]
On the grid, Draw a cumulative frequency graph to represent the data.
(ii)[2]
Estimate the percentage of trees that have a circumference greater than $75\ \text{cm}$.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The circumferences, $c$ cm, of a number of trees in a wood were measured. The findings are set out in the table: Circumference $40 < c \leq 50$ (frequency $14$), $50 < c \leq 80$ (frequency $48$), $80 < c \leq 100$ (frequency $70$), $100 < c \leq 120$ (frequency $8$).
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct cumulative frequency figures given, for example $(50,14),(80,62),(100,132),(120,140)$” …
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