In a class there are 12 boys and 16 girls One of them is called out by an enroll number what is the ...........

Quantitative Aptitude ( CCS) Probability

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?

1/4

2/5

5/12

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.

Hence, option 4 is the correct answer.

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