First Question
- Mr. Jones has two children. The older child is a girl. What is the probability that both children are girls?
Under the forementioned assumptions, in this problem, a random family is selected. In this sample space, there are four equally probable events:
| Older child | Younger child |
|---|---|
| Girl | Girl |
| Girl | Boy |
Only two of these possible events meet the criteria specified in the question (e.g., GG, GB). Since both of the two possibilities in the new sample space {GG, GB} are equally likely, and only one of the two, GG, includes two girls, the probability that the younger child is also a girl is 1/2.
Read more about this topic: Boy Or Girl Paradox
Famous quotes containing the word question:
“Philosophically, incest asks a fundamental question of our shifting mores: not simply what is normal and what is deviant, but whether such a thing as deviance exists at all in human relationships if they seem satisfactory to those who share them.”
—Elizabeth Janeway (b. 1913)
“The question mark is alright when it is all alone when it
is used as a brand on cattle or when it could be used
in decoration but connected with writing it is
completely entirely completely uninteresting.... A
question is a question, anybody can know that a
question is a question and so why add to it the
question mark when it is already there when the
question is already there in the writing.”
—Gertrude Stein (1874–1946)