【官方】SAT数学每日一题附答案和解析(2018年3月5日)

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每日一练：数学

MathematicsStandard Multiple Choice

Read the following SAT test question and thenclick on a button to select your

answer.

The table above gives the results of a survey about whether or not

participants brought alaptop on their most recent vacation. If one of the

participants is selected at random, what isthe probability that the participant

is female, given that the participant brought a laptop onvacation? (Round your

answer to the nearest hundredth.)

A..21

B..32

C..40

D..65

答案：D

解析：

Choice D is correct. In the sample, the total numberof participants who

brought laptops on vacation was324. It is given that the participant brought

alaptop on vacation. Therefore the probability thatthe participant was female

given that the participant brought a laptop on vacation is theprobability of

selecting a female from the group of participants who brought laptops. This

canbe calculated as 212/324≈.65. Therefore the probability of selecting a female

given that aparticipant brought a laptop on vacation is approximately .65.

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