find the first quartile of 7,8,7,9,11,8,7,9,6 and 8.
MATHEMATICS
WAEC 2021
find the first quartile of 7,8,7,9,11,8,7,9,6 and 8.
- A. 8.5
- B. 7.0
- C. 7.5
- D. 8.0
Correct Answer: B. 7.0
Explanation
Rearrange data in increasing order: 6,7,7,7,8,8,8,9,9 and 11
First quartile (ungrouped data) = \(\frac{n}{4}\)th value
= \(\frac{10}{4}\)
= 2.5th value
= \(\frac{7 + 7}{2}\)
= 7.0
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