Each of the 90 students in a class speak at least Igbo or Hausa. If
FURTHER MATHEMATICS
WAEC 2015
Each of the 90 students in a class speak at least Igbo or Hausa. If 56 students speak Igbo and 50 speak Hausa, find the probability that a student selected at random from the class speaks Igbo only.
- A. \(\frac{28}{45}\)
- B. \(\frac{4}{9}\)
- C. \(\frac{8}{45}\)
- D. \(\frac{1}{9}\)
Correct Answer: B. \(\frac{4}{9}\)
Explanation
Let the number of candidates that speak both Igbo and Hausa = x
The number that speaks Igbo only = 56 - x
The number that speaks Hausa only = 50 - x
56 - x + x + 50 - x = 90
106 - x = 90
x = 16
P(Igbo only) = \(\frac{56 - 16}{90} = \frac{4}{9}\)
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