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WAEC Further Mathematics 2008 Question 29

Question 29

Probability

The table shows the distribution of marks by some candidates in a test.
Marks: 2, 3, 4, 5, 6, 7, 8
No of students: 5, 7, 9, 6, 3, 6, 4
If a student is selected at random, what is the probability that she scored at least 6 marks?

  1. A.3/40
  2. B.1/4
  3. C.13/40
  4. D.27/40
Show the answer and explanation

Answer: C (13/40)

Explanation

Students scoring 6, 7 or 8: 3 + 6 + 4 = 13 out of 40, so the probability is 13/40.