I actually had an argument with my statistics professor about this... The question she gave was basically this: 'The king has one sibling, what is the probabil

I actually had an argument with my statistics professor about this... The question she gave was basically this: 'The king has one sibling, what is the probability that it is a boy?' I actually took an opposing view to her initially and then came back the next day saying that it is ambiguous and depends on what we assume about the king, but she wouldn't even agree with me on that.