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It is not possible to answer the question for a number of reasons.
The gender of children are not independent of one another. They depends on the parents.
Second, the feeble-mindedness of the child or otherwise is greatly influenced by their nurture: the family and school play an important role in that context. This will affect feeble-minded boys equally.
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What is the probability of a family having a boy after four girls?
The probability of a boy is still 0.5 no matter how many prior children there are.
What is the probability of a couple having at least four girls if they have six children?
3 out of 7
What is the probability that a family with four children has all boys given that the first two are boys?
There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes. However, if you assume that they are independent events then, given that the probability of a boy is approx 0.52, the probability of the other two being boys is 0.2672.
What is the probability of tossing four coins and getting four heads if the first two tosses are heads?
The conditional probability is 1/4.
What is the probability of tossing four coins and getting tails on all four?
Assuming it is a fair coin, the probability is 1/24 = 1/16.
