Question

There are 35 students in a class of whom 20 are boys and 15 are girls. From these students one is chosen at random. What is the probability that the chosen student is a boy.

Answer 1

Total number of students = 35

Number of boys = 20

Number of girls = 15

Let E₁ be the event that the chosen student is a boy.

∴ P(choosing a boy) = P(E₁) = `("Number of outcomes favourable to ""E"_1)/ "Number of all possible outcome" = 20/35 = 4/7`

Thus, the probability that the chosen student is a boy is `4/7`