CAIE A-Level Mathematics A2 5.1.4 A Cumulative Frequency Graph E Questions

Practise using cumulative-frequency graphs to estimate quartiles, percentiles and interquartile ranges.

Exam points

read quartiles and percentiles from cumulative-frequency graphs
estimate interquartile ranges and threshold values
interpret cumulative-frequency distributions and their spread

[Maximum number: 1]

The times, t minutes, taken to complete a walking challenge by 250 members of a club are summarised in the table.

Table for Question CAIE A-Level Mathematics A2 5.1.4 A Cumulative Frequency Graph E Questions question 1 — CAIE A-Level Mathematics A2

Use your graph to estimate the 60th percentile of the data.

Line drawn from 150 on cf axis to meet graph at about
t=38 minutes

B1 FT

Must be an increasing cf graph with correct upper bounds.
Use of graph must be seen.
Expect an answer in range $37 \leqslant t \leqslant 39$ for a correct graph

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CAIE A-Level Mathematics A2 5.1.4 A Cumulative Frequency Graph E Questions question 1