Out of 70 schools, 42 of them can be attended by boys and 35 can
FURTHER MATHEMATICS
WAEC 2018
Out of 70 schools, 42 of them can be attended by boys and 35 can be attended by girls. If a pupil is selected at random from these schools, find the probability that he/ she is from a mixed school.
- A. \(\frac{1}{11}\)
- B. \(\frac{1}{10}\)
- C. \(\frac{1}{6}\)
- D. \(\frac{1}{5}\)
Correct Answer: B. \(\frac{1}{10}\)
Explanation
Let the number of mixed schools be S
The number of boys only = 42 - S
The number of girls only = 35 - S
(42 - S) + S + (35 - S) = 77 - S = 70
\(\implies\) S = 7
\(Probability = \frac{7}{70} = \frac{1}{10}\)
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