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JAMB Mathematics 2006 Question 7

Question 7

Probability

GSM operators: GTN, PLO, Qtel, Cmob
No. of recharge cards: 5, 6, 3, 6
The table above shows the distribution of recharge cards of four major GSM operators. What is the probability that a recharge card selected at random will be GTN or Qtel?

  1. A.3/20
  2. B.1/4
  3. C.2/5
  4. D.3/4
Show the answer and explanation

Answer: C (2/5)

Explanation

There are 20 cards and 5 + 3 = 8 are GTN or Qtel, so the probability is 8/20 = 2/5.