CAIE IGCSE Mathematics Extended Quartiles Range and IQR

Practise calculating averages, quartiles, range and interquartile range from individual values, discrete frequencies and five-number summaries.

Exam points

calculate the mean of discrete data with a value-by-frequency total divided by total frequency
locate lower quartile, median and upper quartile positions from ordered values or frequencies
subtract minimum from maximum for the range and lower quartile from upper quartile for the IQR

[Maximum number: 2]

200 students estimate the volume, $V \mathrm{~m}^{3}$ , of a classroom. The cumulative frequency diagram shows their results.

Use the graph to find an estimate of

the interquartile range,

___ m^3

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