WAEC - Mathematics (2021 - No. 35)
find the first quartile of 7,8,7,9,11,8,7,9,6 and 8.
8.5
7.0
7.5
8.0
Explanation
Rearrange data in increasing order: 6,7,7,7,8,8,8,9,9 and 11
First quartile (ungrouped data) = \(\frac{n + 1}{4}\)th value
= \(\frac{11}{4}\)
= 2.75th value
= \(\frac{7 + 7}{2}\)
= 7.0
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