4. A public library carries 50 magazines that focus on either news or sports. Thirty of them focus on news and the remaining 20 focus on sports. Among the 30 news magazines, 20 include international news and 10 include national, state or local news only. Among the 20 sports magazines, 5 focus on international sports and the remaining 15 focus on national, state, or local sports. a. A customer randomly selects a magazine from the table, what is the probability that it focuses on sports? b. What is the probability that the magazine includes international news given that it focuses on news?

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