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SAT官方每日一题附答案和解析[数学](2018年3月5日)
日期:2018-03-05 14:03

(单词翻译:单击)

每日一题

Mathematics>Standard Multiple Choice

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

答案和解析

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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重点单词
  • approximatelyadv. 近似地,大约
  • calculatedadj. 计算出的;适合的;有计划的 v. 计算;估计;
  • surveyv. 调查,检查,测量,勘定,纵览,环视 n. 调查,纵
  • multipleadj. 许多,多种多样的 n. 倍数,并联
  • samplen. 样品,样本 vt. 采样,取样 adj. 样
  • participantn. 参与者
  • probabilityn. 可能性,或然率,机率
  • randomadj. 随机的,随意的,任意的 adv. 随机地 n.