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 (i) boy, (ii) girl?

Question

Philoid · Accepted Answer

Total numbers of students are: 35

(i) Let E be the event of choosing a boy at random

Then, the numbers of favourable outcome are: 20

∴ P (choosing a boy) = P (E) = 20/35 = 4/7 or 57%

(ii) Let E be the event of choosing a girl at random

Then, the numbers of favourable outcome are= 15

∴ P (choosing a girl) = P (E) = 15/35 =3/7 or 43%