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JAMB Mathematics 1979 Question 46

Question 46

Measures of Central Tendency

The following table relates the number of objects f corresponding to a certain size x. What is the average size of an object?
f: 1, 2, 3, 4, 5
x: 1, 2, 4, 8, 16

  1. A.31/15
  2. B.31/5
  3. C.129/5
  4. D.43/5
  5. E.16/5
Show the answer and explanation

Answer: D (43/5)

Explanation

Σfx = 1 + 4 + 12 + 32 + 80 = 129 and Σf = 15, so the mean is 129/15 = 43/5.