A class contains 12 boys and 8 girls. The teacher calls on a student at random to go to the black board. What is the probability that the first student called is a boy? Give the answer up to 1 decimal place.
We know that, Probability of an event E, P(E) =number of favourable outcomestotal number of outcomes
Since there are 12 boys out of a total of 20 students, the required probability is 1220 = 0.6