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JAMB Mathematics 2001 Question 45

Question 45

Measures of Dispersion

Find the variance of 2, 6, 8, 6, 2 and 6.

  1. A.√5
  2. B.√6
  3. C.5
  4. D.6
Show the answer and explanation

Answer: C (5)

Explanation

The mean is 30 ÷ 6 = 5. The squared deviations are 9, 1, 9, 1, 9, 1, which add to 30. Variance = 30 ÷ 6 = 5.