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WAEC Further Mathematics 2022 Question 32

Question 32

Probability

The probability that a student will graduate from a college is 0.4. If 3 students are selected from the college, what is the probability that at least one student will graduate?

  1. A.0.06
  2. B.0.22
  3. C.0.78
  4. D.0.80
Show the answer and explanation

Answer: C (0.78)

Explanation

P(none graduate) = 0.6³ = 0.216, so P(at least one) = 1 − 0.216 = 0.784 ≈ 0.78.