It is currently Mon Oct 22, 2018 12:48 am

 All times are UTC - 5 hours [ DST ]

 Page 1 of 1 [ 1 post ]
 Print view Previous topic | Next topic
Author Message
 Post subject: GRE Probability (Numerical Entry)Posted: Sat Jun 16, 2012 2:38 am

Joined: Sun May 30, 2010 2:23 am
Posts: 498
Assume that births of babies born at a hospital are independent events, with the probability of a girl = 0.5 and the probability of a boy = 0.5 . What is the probability that of the next 3 babies born at the hospital, two of them are girls and one is a boy? (Note: the two girl and one boy babies can be born in any order.) Express your answer as a decimal value, rounded to three decimal places.

Explanation:
The correct answer is 0.375 . There are 8 different ways in which 3 babies can be born: GGG, GGB, GBG, BGG, BBG, BGB, GBB, and BBB. The probability of each of these eight ways is (.5)(.5)(.5) = .125. Notice that exactly three of the eight ways (GGB, GBG, and BGG) satisfy the requirement that two girls and one boy were born. Add these three probabilities together to get .375 .

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 1 post ]

 All times are UTC - 5 hours [ DST ]

#### Who is online

Users browsing this forum: No registered users and 1 guest

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ GMAT    GMAT: Quantitative Section (Math)    GMAT: Verbal Section    GMAT: Integrated Reasoning    GMAT: General Questions GRE    GRE: Quantitative Reasoning (Math)    GRE: Verbal Reasoning    GRE: General Questions General questions    Other questions