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Mathematics, 28.01.2021 17:20 adahlove

1. A university professor fails 20% of his students in the final. After the final, he polls the students and asks how many of them studied more than 3 hours for it. Of those who passed the final, 72% said that they
studied for it. Of those who failed the final, 31% said they studied for it. Make a tree diagram for this
problem and then answer the following questions.

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