Mathematics 9709 · AS & A Level · Representation of data

Representation of data — practice question

The heights of 160 sunflower plants were recorded in cm. The findings are displayed on the cumulative frequency curve below.

(a)[1]

Use the graph to estimate how many plants have heights less than $100$ cm.

(b)[2]

Use the graph to estimate the $65$th percentile for the distribution.

(c)[2]

Use the graph to estimate the interquartile range for the heights of these plants.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct estimate: $60$ (or $61$ accepted)” …