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JAMB Mathematics 1988 Question 48

Question 48

Measures of Central Tendency

If x and y represent the mean and the median respectively of the following set of numbers; 11, 12, 13, 14, 15, 16, 17, 18, 19, 21. Find x/y correct to one decimal place.

  1. A.1.6
  2. B.1.2
  3. C.1.1
  4. D.1.0.
Show the answer and explanation

Answer: D (1.0.)

Explanation

The sum is 156, so the mean is 15.6. The median is (15 + 16)/2 = 15.5. x/y = 15.6/15.5 = 1.006 ≈ 1.0.