WAEC 2020 · Paper 1 · Q47

Dispersion & cumulative frequency

The interquartile range of a distribution is 7. If the 25th percentile is 16, find the upper quartile.

Worked solution (try it first)

The 25th percentile is the lower quartile, so $Q_1 = 16$ .
The interquartile range is $Q_3 - Q_1 = 7$ , so $Q_3 = 16 + 7 = 23$ , option C.

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