(i)[4]
Calculate the value of $x$ and the height of the $51$-$70$ rectangle.
(ii)[3]
Calculate an estimate of the mean weight of the stones.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
The weights, in grams, of several stones, each measured to the nearest gram, are summarised in the table below. A histogram has been drawn using a vertical scale of 1 cm to 1 unit, where the unit stands for frequency density. The $1$-$10$ rectangle has a height of $3$ cm.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A try at applying frequency density $= \frac{\text{frequency}}{\text{class width}}$” …
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