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6-64.

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

Recall the Addition Rule. The Addition Rule is or and .

(students involved in a club) (students who study more than hours per day) (students who do either)
(students who do both)