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WAEC Mathematics 2015 Question 27

Question 27

Measures of Dispersion

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.

  1. A.62
  2. B.63
  3. C.64
  4. D.65
Show the answer and explanation

Answer: B (63)

Explanation

The scores are already in order; the third quartile is the ¾ × 20 = 15th score, which is 63.