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This problem were told the publisher sent advertising materials for an account text.
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80 % of all professors teaching the appropriate accounting course.
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The probability of a professor is 80%.
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30 % of the professors who receive this material adopted the book.
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So the probability of adoption, given they got it, is 30%.
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And 10 % who did not receive their materials.
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So a probability of accepting that given p complement, in other words, they did not get it.
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Is 10%.
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We don't find the probability a professor who adopts the book has received the advertising material.
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So we know the probability of receiving the advertising materials given they adopted it.
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Now this is going to be equal to the probability of they received it and they adopted it over the probability that they adopted it...