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GCE Mathematics 1990 Question 50

Question 50

Probability

Two groups of male students cast their vote on a particular proposal. The results are as follows:
Group A: In favour 128, Against 32
Group B: In favour 96, Against 48
If a student is chosen at random, what is probability that he is against the proposal?

  1. A.3/19
  2. B.4/19
  3. C.5/19
  4. D.9/19
  5. E.10/19
Show the answer and explanation

Answer: C (5/19)

Explanation

80 of the 304 students are against: 80/304 = 5/19.