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JAMB Mathematics 1987 Question 48

Question 48

Measures of Central Tendency

The numbers 3, 2, 8, 5, 7, 12, 9 and 14 are the marks scored by a group of students in a class test. If P is the mean and Q the median, then P + Q is

  1. A.18
  2. B.17½
  3. C.16
  4. D.15
Show the answer and explanation

Answer: D (15)

Explanation

The total is 60, so the mean is 60/8 = 7.5. In order, 2, 3, 5, 7, 8, 9, 12, 14, the median is (7 + 8)/2 = 7.5. P + Q = 15.