In a class, there are 12 boys and 16 girls. One of them is called out by an enroll number, what is the probability that the one called is a girl?
Quantitative Aptitude PROBABILITY in Quantitative Aptitude 1 year ago
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manpreet![Tuteehub forum best answer]()
Best Answer
1 year ago
4/7
Let S be the SAMPLE space.
Total number of students in the CLASS = 12 boys + 16 girls = 28.
Then, n(S) = 28.
Let E be the event of CALLING one of them by ENROLL number.
Given that, number of girls = 16.
Then, n(E) = 16.
The PROBABILITY that the one called is a girl = n(S)/n(E) = 16/28 = 4/7.