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5-55.

In a random sample of college students, a research company found that were involved in a club and studied or more hours per day. When they reported their findings, the research company indicated that of college students were either involved in a club or they studied or more hours per day. Given this information, what is the probability that a college student is involved in a club and studies or more hours per day? 

Recall the Addition Rule. The Addition Rule is .