GCSE Secondary Maths Age 13-17 - Probability & Statistics: Probability - Explained

The video tutorial explains a probability problem involving boys and girls in a classroom. It starts by stating the probability of randomly picking a boy as 1/3. The tutorial then calculates the probability of picking a girl, which is 2/3, by subtracting the probability of picking a boy from 1. The final answer of 2/3 is highlighted as the solution to the problem.

In a classroom, if the probability of selecting a boy at random is 1/3, what does this imply about the number of boys?

• There are fewer boys than girls.

• There are more boys than girls.

• The number of boys and girls is equal.

• The number of boys is twice the number of girls.

If the probability of choosing a boy is 1/3, what is the probability of choosing a girl?

• 2/3

• 1

• 1/2

• 1/3

What is the remaining probability if 1/3 of the class are boys?

• 1

• 1/3

• 1/2

• 2/3

If 1/3 of the class are boys, what fraction represents the girls?

• 1/3

• 1/2

• 2/3

• 1

What is the significance of the final answer of 2/3 in the context of the classroom?

• It is irrelevant to the problem.

• It represents the total number of students.

• It indicates the probability of picking a girl.

• It shows there are more boys.