A man has an 81 percent chance to get married if they live the United States before the age of 40. A woman has an 86 percent chance of getting married.
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The probability of a boy is still 0.5 no matter how many prior children there are.
Since the probability of having a son is about 1/2, the probability of the first 4 children being boys is about (1/2)4.
3 out of 7
No.
We would need to know the number of children in the family to answer this question. For instance, the probability of having no girls in a family of two children would be 1/4 theoretically. In general it is 2-n where n is the number of children.