Children's Speaking Parts and Probabilities

The video tutorial explains a probability question involving a class play with 20 children, 8 of whom are boys. It calculates the probability of a child having a speaking part by determining the number of boys and girls with speaking parts, then reducing the fraction to find the final probability of 2/5.

What is the total number of children in the class play?

• 25

• 20

• 30

• 15

How many boys are in the class play?

• 8

• 10

• 5

• 12

If there are 20 children and 8 are boys, how many are girls?

• 10

• 16

• 12

• 14

How many boys have a speaking part in the play?

• 2

• 5

• 3

• 4

If 4 boys have a speaking part, how many do not?

• 4

• 5

• 3

• 2

How many girls do not have a speaking part?

• 8

• 6

• 9

• 7

If 8 girls do not speak, how many have a speaking part?

• 4

• 3

• 5

• 2

What is the total number of children with speaking parts?

• 12

• 10

• 8

• 6

What is the probability that a randomly chosen child has a speaking part?

• 1/2

• 2/5

• 3/5

• 4/5

What is the numerator in the probability fraction for children with speaking parts?

• 4

• 6

• 8

• 10