Question

Your neighbour has 2 children. You learn that he has a son, joe. What is the probability that joes sibling is a brother?

Answer 1

one of the children should be either boy or girl,so one of two1/2

Answer 2

The probability that the other sibling is a brother is 1:3.

Step-by-step explanation:

Given:

The number of siblings= 2

Joe's gender= male

To find = the probability that the other sibling is a brother

Solution:

Since we know that one of the children is a boy,

We can have any of the following three combinations:

(Boy, boy)

(Boy, girl)

(Girl, boy)

So, the number of observations =3

The probability that the child is a boy =1÷3

=1:3

Result:

Thus, the probability that the other sibling is a brother is 1:3.

(#SPJ3)