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WAEC Further Mathematics 2009 Question 33

Question 33

Statistics

If the mean of −1, 0, 9, 3, k, 5 is 2, where k is constant, find the median of the set of numbers.

  1. A.0
  2. B.3/2
  3. C.7/2
  4. D.6
Show the answer and explanation

Answer: B (3/2)

Explanation

(16 + k)/6 = 2 gives k = −4. In order: −4, −1, 0, 3, 5, 9, so the median is (0 + 3)/2 = 3/2.