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JAMB Mathematics 1993 Question 49

Question 49

Measures of Dispersion

Calculate the standard deviation of the following data 7, 8, 9, 10, 11, 12, 13

  1. A.2
  2. B.4
  3. C.10
  4. D.11
Show the answer and explanation

Answer: A (2)

Explanation

The mean is 10. The squared deviations are 9, 4, 1, 0, 1, 4, 9, total 28. Variance = 28/7 = 4, so the standard deviation is 2.