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JAMB Mathematics 2005 Question 45

Question 45

Measures of Dispersion

The modal height and range of heights 1.35, 1.25, 1.35, 1.40, 1.35, 1.45, 1.50, 1.35, 1.50 and 1.20 are m and r respectively. Find m + 2r.

  1. A.1.35
  2. B.1.65
  3. C.1.95
  4. D.3.00
Show the answer and explanation

Answer: C (1.95)

Explanation

1.35 appears most often, so m = 1.35. r = 1.50 − 1.20 = 0.30. m + 2r = 1.95.