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WAEC Further Mathematics 2011 Question 24

Question 24

Statistics

The mean of 2, 5, (x + 2), 7 and 9 is 6. Find the median.

  1. A.5.5
  2. B.6.0
  3. C.6.5
  4. D.7.0
Show the answer and explanation

Answer: D (7.0)

Explanation

The sum is 5 × 6 = 30, so 25 + x = 30 and x = 5. The numbers are 2, 5, 7, 7, 9, whose middle value is 7.