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WAEC Mathematics 1993 Question 40

Question 40

Measures of Central Tendency

The table below shows the scores of a group of 40 students in a Physics test.
Score: 1, 2, 3, 4, 5, 6, 7, 8, 9
Freq.: 2, 3, 6, 7, 9, 6, 2, 2, 3
What is the mean of the distribution?

  1. A.4.2
  2. B.4.5
  3. C.4.8
  4. D.5.0
  5. E.5.2
Show the answer and explanation

Answer: C (4.8)

Explanation

Σfx = 2 + 6 + 18 + 28 + 45 + 36 + 14 + 16 + 27 = 192. Mean = 192 ÷ 40 = 4.8.