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WAEC Mathematics 2022 Question 38

Question 38

Measures of Dispersion

The ages (years) of some members in a singing group are: 12, 47, 49, 15, 43, 41, 13, 39, 43, 41 and 36. Find the lower quartile.

  1. A.12
  2. B.13
  3. C.15
  4. D.20
Show the answer and explanation

Answer: C (15)

Explanation

In order: 12, 13, 15, 36, 39, 41, 41, 43, 43, 47, 49. The lower quartile is the (11 + 1)/4 = 3rd value, 15.