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JAMB Mathematics 2014 Question 47

Question 47

Measures of Dispersion

Calculate the standard deviation of 5,4,3, 2 and 1.

  1. A.√10
  2. B.√2
  3. C.√3
  4. D.√6
Show the answer and explanation

Answer: B (√2)

Explanation

The mean is 3. The squared deviations are 4, 1, 0, 1, 4, which add to 10. Variance = 10 ÷ 5 = 2, so the standard deviation is √2.