We're trying to work out the probability someone is a librarian given they look like one - P(H|E), in layman's terms, the probabilities we need to construct the diagram below are:
The percentage of librarians in the whole population - P(H)
The percentage of librarians that look like librarians - P(E|H)
The percentage of non-librarians that look like librarians - P(E|¬H)
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