WAEC Mathematics 2025 Objective — Question 47
Question 47 of 51 from the West African Examinations Council (WAEC) Mathematics 2025 Objective paper, with the correct answer and a full explanation.
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The interquartile range of a distribution is 7. If the 25th percentile is 16, find the upper quartile.
- A. 35
- B. 30
- C. 23Correct
- D. 9
Explanation
Interquartile range (IQR) = Q3-Q1 = 7. Given Q1 (25th percentile) = 16, Q3 = Q1 + 7 = 16+7 = 23.
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