The members of a consulting farm rent cars from three rental agencies: 60 percent from agency 1, 30 percent from agency 2, 10 percent from agency 3. If 9 percent of the cars from agency 1 need an oil change, , 20 percent of the cars from agency 2 need an oil change, 6 percent of the car from agency 3 needs an oil change, what is the probability that a rental car delivered to the firm will need an oil change?
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35/100 =7/20
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