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WAEC Mathematics 2012 Question 30

Question 30

Data Presentation

The bar chart shows the frequency distribution of marks scored by students in a class test. Calculate the mean of the distribution.

Diagram for this question
  1. A.6.0
  2. B.3.0
  3. C.2.4
  4. D.1.8
Show the answer and explanation

Answer: C (2.4)

Explanation

Σfx = 1(6) + 2(8) + 3(6) + 4(5) = 60. Mean = 60/25 = 2.4.