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OpenStudy (anonymous):
Mr.Brown chooses one book from the library each week. He chooses a crime novel or a horror story or a non-fiction book. The probabilty that he chooses a horror story is 0.4. The probability that he chooses a non-fiction book is 0.15. Work out the probability that Mr.Brown chooses a crime novel.
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OpenStudy (amistre64):
Mr.Brown chooses one book from the library each week. He chooses a crime novel or a horror story or a non-fiction book. The probabilty that he chooses a horror story is 0.4. The probability that he chooses a non-fiction book is 0.15. Work out the probability that Mr.Brown chooses a crime novel. what do we know about the total of probablity of all the things that can happen?
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