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JAMB Mathematics 1995 Question 46

Question 46

Measures of Dispersion

The variance of the scores 1, 2, 3, 4, 5, is

  1. A.1.2
  2. B.1.4
  3. C.2.0
  4. D.3.0
Show the answer and explanation

Answer: C (2.0)

Explanation

The mean is 3. The squared deviations are 4, 1, 0, 1, 4, total 10. Variance = 10/5 = 2.0.