The scores of twenty students in a test are as follows: 44, 47, 48, 49,
MATHEMATICS
WAEC 2015
The scores of twenty students in a test are as follows: 44, 47, 48, 49, 50, 51, 52, 53, 53, 54, 58, 59, 60, 61, 63, 65, 67, 70, 73, 75. Find the third quartile.
- A. 62
- B. 63
- C. 64
- D. 65
Correct Answer: C. 64
Explanation
Third quartile Q3 = \(\frac{3}{4}\)Nth
Alternatively:
Split the score into equal quarters
44, 47, 48, 49, 50, 51, 52, 53, 53, 54, 58, 59, 60, 61, 63, 65, 67, 70, 73, 75.
Third quartile Q3 = [63 + 65] / 2 = 64
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