a class contains 15 boys and 21 girls.a student is chosen at random.what is the probability that a boy is chosen?
total = 36 students
prob(boy) = 15/36 = 5/12
5/12
5/12
Yes, that is correct. The probability of choosing a boy from a class of 15 boys and 21 girls at random is 5/12.
To find the probability of selecting a boy at random, we need to determine the total number of possible outcomes (sample space) and the number of favorable outcomes (number of boys).
In this scenario, the sample space consists of all the students in the class, which is the sum of the number of boys and girls: 15 boys + 21 girls = 36 students.
The number of favorable outcomes is the number of boys in the class, which is 15.
Now we can calculate the probability of selecting a boy:
Probability (boy) = Number of favorable outcomes / Total number of possible outcomes
= 15 boys / 36 students
= 5/12
Therefore, the probability of choosing a boy at random from the class is 5/12.