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WAEC Mathematics 2022 Question 45

Question 45

Measures of Central Tendency

The mean of two numbers x and y is 4. Find the mean of the four numbers x, 2x, y and 2y.

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

Answer: C (6)

Explanation

x + y = 8, so x + 2x + y + 2y = 3(x + y) = 24 and the mean is 24 ÷ 4 = 6.