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JAMB Mathematics 1998 Question 42

Question 42

Measures of Central Tendency

If m and n are the mean and median respectively of the set of numbers 2, 3, 9, 7, 6, 7, 8, 5, find m + 2n to the nearest whole number.

  1. A.19
  2. B.18
  3. C.13
  4. D.12
Show the answer and explanation

Answer: A (19)

Explanation

Sum = 47 for 8 numbers, so m = 5.875. In order: 2, 3, 5, 6, 7, 7, 8, 9, so n = (6 + 7)/2 = 6.5. m + 2n = 18.875 ≈ 19.