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WAEC Mathematics 2018 Question 41

Question 41

Measures of Dispersion

Find the inter-quartile range of 1, 3, 4, 5, 8, 9, 10, 11, 12, 14, 16.

  1. A.6
  2. B.7
  3. C.8
  4. D.9
Show the answer and explanation

Answer: C (8)

Explanation

With 11 values Q₁ is the 3rd value (4) and Q₃ is the 9th value (12); 12 − 4 = 8.