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
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 \(Probability = \frac{7}{70} = \frac{1}{10}\)
