Question

What is the expected number of female children in a family with three children?

1

1.5

2

2.5

Answer 1

The answer is 1.5 females, one way to solve this is to multiply the probability of a female (50%) with the number of girls in total = 3 multiplied by (50%) = 1.5.

Answer 2

Option B is the correct answer.

Explanation:

Expected value of female children= Probability of female children x Total number of children.

A child can be male or female, so there are 2 combinations, favorable outcome is female.

Probability of female children
`=(1)/(2)`

Expected value of female children
`=(1)/(2)* 3=1.5`

Option B is the correct answer.