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I don't understand these two questions During a half hour of television programming, eight minutes is used for commercials. If a television set is turned

I don't understand these two questions

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During a half hour of television programming, eight minutes is used for commercials. If a television set is turned on at a random time during the half hour, what is the probability that a commercial is not being shown? 4 15 0 0 0 1The table shows the student population of Richmond High School this year. Girls (G) Boys (B) Total Grade 11 (J) 150 210 360 Grade 12 (S) 200 140 340 Total 350 350 700 What is P(GIJ)

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