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JAMB Mathematics 2007 Question 7

Question 7

Measures of Dispersion

What is the mean deviation of 3, 5, 8, 11, 12 and 21?

  1. A.4.7
  2. B.60
  3. C.3.7
  4. D.10
Show the answer and explanation

Answer: A (4.7)

Explanation

The mean is 60/6 = 10. The absolute deviations are 7, 5, 2, 1, 2, 11, which total 28, so the mean deviation = 28/6 ≈ 4.7.