Question on: WAEC Mathematics - 2018
Find the inter-quartile range of 1, 3, 4, 5, 8, 9, 10, 11, 12, 14, 16
A
6
B
7
C
8
D
9
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Correct Option: B
\(Q_1 = \frac{1}{4}\)Nth
\(\frac{1}{4} \times 11^{th}\) no.
= 2\(\frac{3}{4}th\) (\(\cong\) 4)
\(Q_3 = \frac{3}{4}\) Nth
= \(\frac{3}{4}\) x 11th no.
= 8\(\frac{1}{4}\) no. (\(\cong\) 11) (\(\cong\) 11)
Hence, interquartile range
= \(Q_3 = Q_1\)
= 11 - 4
= 7
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