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WAEC Further Mathematics 2006 Question 34

Question 34

Statistics

The mean and median of integers x, y, z and t are 5 and z respectively. If x < y < z < t and y = 4, find (x + t)

  1. A.12
  2. B.11
  3. C.10
  4. D.8
Show the answer and explanation

Answer: A (12)

Explanation

The sum is 4 × 5 = 20. The median (y + z)/2 equals z, so z = y = 4. Then x + t = 20 − 4 − 4 = 12.