CAIE IGCSE Mathematics Extended E9.6.2 Estimate and Interpret the Median Percentiles Quartiles and Questions

Practise Extended CAIE IGCSE Mathematics by reading medians, percentiles, quartiles and interquartile ranges from cumulative frequency diagrams in context.

Exam points

Estimate medians, quartiles, percentiles and interquartile ranges from cumulative frequency diagrams.
Read cumulative frequencies and corresponding data values accurately using the graph scale.
Interpret percentile and quartile estimates in the context and units of the distribution.

[Maximum number: 5]

A student measures the height, $h \mathrm{~cm}$ , of each of 400 plants.

(a)

The cumulative frequency diagram shows the results.

Figure for Question (a) — CAIE IGCSE Mathematics Extended

Use the diagram to find an estimate for

[ 5 ]

(i)

the median cm [1]

[ 1 ]

(ii)

the interquartile range cm [2]

[ 2 ]

(iii)

the 80th percentile cm [2]

[ 2 ]

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CAIE IGCSE Mathematics Extended E9.6.2 Estimate and Interpret the Median Percentiles Quartiles and Questions question 1

Question (a)

Question (i)

Question (ii)

Question (iii)