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An insurance company pays hospital claims. The number of claims that include emergency room or operating room charges is 85% of the total number of claims. The number of claims that do not include emergency room charges is 25% of the total number of claims. The occurrence of emergency room charges is independent of the occurrence of operating room charges on hospital claims.

Calculate the probability that a claim submitted to the insurance company includes operating room charges.


What would I need to study to solve this problem? Are there any resources that I can get for free online?
 
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This is a basic probability question. The videos here should help you with that.
 

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