(a)[4]
Draw a histogram to show this data.
(b)[3]
Calculate an estimate for the mean time taken by these students to complete the puzzle.
(c)[1]
Within which class interval does the lower quartile of the times lie?
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
The times, measured in minutes, needed by $150$ students to finish a puzzle are shown in the table. The time intervals are $0 \leq t < 20$, $20 \leq t < 30$, $30 \leq t < 35$, $35 \leq t < 40$, $40 \leq t < 50$, $50 \leq t < 70$ with matching frequencies $8$, $23$, $35$, $52$, $20$, and $12$.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Calculates at least five correct frequency densities $\frac{f}{\text{class width}}$.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI