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Comment by Vakaiser

Here's the wikipedia article for this problem: https://en.wikipedia.org/wiki/Boy_or_girl_paradox

Personally, I find that the ambiguity and phrasing of the question is what leads to pedantic 'gotchas'.

9017 children are born and 4263 are female while the remainder are male; what's the probability that the next child born is female?

It's 50%, if one assumes a bimodal distribution without atypical karyotypic deviations. Preceding births do not determine future births. They are causally independent events.

1245 of those children were born on Friday; what's the probability that the next child is male?

Still 50%. Week day of birth does not impact sex distribution.

It's the way the question is worded that splits this into an intuitive biological problem or an obtuse probability problem.

parent Vakaiser 3 days ago

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