7) According to a survey of American households, the probability that the residents own 2 cars if annualhousehold income is over $25,000 is 80%. Of the households surveyed, 60% had incomes over $25,000 and 70%had 2 cars. What is the probability that the residents of a household do not own 2 cars and have an income over$25,000 a year?A) 0.48B) 0.12C) 0.22D) 0.18

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8) A company has 2 machines that produce widgets. An older machine produces 23% defective widgets, while thenew machine produces only 8% defective widgets. In addition, the new machine produces 3 times as manywidgets as the older machine does. Given a randomly chosen widget was tested and found to be defective,what is the probability it was produced by the new machine?

TABLE 4‐1Mothers Against Drunk Driving is a very visible group whose main focus is to educate the public about the harm caused bydrunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Four hundredaccidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved andwhether alcohol played a role in the accident. The numbers are shown below:Number of VehiclesInvolvedDid alcohol play a role?123TotalsYes5010020170No2517530230Totals75275504009) Referring to Table 4‐1, what proportion of accidents involved more than one vehicle?

10) Referring to Table 4‐1, what proportion of accidents involved alcohol and a single vehicle?

11) Referring to Table 4‐1, what proportion of accidents involved alcohol or a single vehicle?A) 245/400 or 61.25%B) 195/400 or 48.75%C) 25/400 or 6.25%D) 50/400 or 12.5%

12) Referring to Table 4‐1, given that multiple vehicles were involved, what proportion of accidents involvedalcohol?