Read the following SAT test question and then click on a button to select your answer.

　　The table above gives the results of a survey about whether or not participants brought a laptop on their most recent vacation. If one of the participants is selected at random, what is the probability that the participant is female, given that the participant brought a laptop on vacation? (Round your answer to the nearest hundredth.)

　　A..21

　　B..32

　　C..40

　　D..65

　　【答案解析】

　　答案：D

　　解析：

　　Choice D is correct. In the sample, the total number of participants who brought laptops on vacation was 324. It is given that the participant brought a laptop on vacation. Therefore the probability that the participant was female given that the participant brought a laptop on vacation is the probability of selecting a female from the group of participants who brought laptops. This can be calculated as 212/324≈.65. Therefore the probability of selecting a female given that a participant brought a laptop on vacation is approximately .65.

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