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JAMB Mathematics 1997 Question 48

Question 48

Measures of Dispersion

Find the difference between the range and the variance of the following set of numbers 4, 9, 6, 3, 2, 8, 10, 5, 6, 7 where Σd2 = 60.

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

Answer: A (2)

Explanation

Range = 10 − 2 = 8. Variance = Σd²/n = 60/10 = 6. The difference is 8 − 6 = 2.