In a class, there are 16 boys and 24 girls. One of them is called out by an enroll number. What is the probability that the one called is a girl?
Let S be the sample space. Total number of students in the class = 16 boys and 24 girls = 40 Then, n(S) = 40 Let E be the Event of calling one of them by enroll number Given that, number of girls = 24 Then, n(E) = 24 The probability that the one called is a girl = (n(S))/(n(E)) = 24/40 = 3/5
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