Probability Quiz
Posted: Thu Jul 17, 2008 11:35 am
A random two-child family with at least one boy is chosen. What is the probability that it has a girl?
Page 1 of 2
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:44 am
1/2
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:44 am
The probability is 2 out of 3! 
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:46 am
I've seen this question b4 in a stats class, it's two thirds. Only three possibilities with at least a boy, and out the the three possibilities, 2 out the three has a girl.
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:52 am
RebelLion wrote:I've seen this question b4 in a stats class, it's two thirds. Only three possibilities with at least a boy, and out the the three possibilities, 2 out the three has a girl.
I answered it before you, gimmie credit for that you fathead!
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:55 am
Does the mom count?
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:55 am
siren wrote:RebelLion wrote:I've seen this question b4 in a stats class, it's two thirds. Only three possibilities with at least a boy, and out the the three possibilities, 2 out the three has a girl.
I answered it before you, gimmie credit for that you fathead!
you probably cheated
I actually hated probability, it's good think I don't use it much in my field but I was forced to take a class for my undergrad.
Re: Probability Quiz
Posted: Thu Jul 17, 2008 11:58 am
four possible combination:
boy, boy
boy, girl
girl, girl
girl, boy
first child is a boy, this eliminates,
boy, boy
girl, boy
Answer= 1/2
boy, boy
boy, girl
girl, girl
girl, boy
first child is a boy, this eliminates,
boy, boy
girl, boy
Answer= 1/2
Re: Probability Quiz
Posted: Thu Jul 17, 2008 12:01 pm
RebelLion wrote:siren wrote:RebelLion wrote:I've seen this question b4 in a stats class, it's two thirds. Only three possibilities with at least a boy, and out the the three possibilities, 2 out the three has a girl.
I answered it before you, gimmie credit for that you fathead!
you probably cheated
I actually hated probability, it's good think I don't use it much in my field but I was forced to take a class for my undergrad.
Why should I cheat? it was easy, it took you a while to break it down though!
Re: Probability Quiz
Posted: Thu Jul 17, 2008 12:24 pm
ms.nalia wrote:Does the mom count?
Siren and Rebel got it right
Re: Probability Quiz
Posted: Thu Jul 17, 2008 3:14 pm
Navy9 wrote:ms.nalia wrote:Does the mom count?
Siren and Rebel got it right
I knew I was right!
Re: Probability Quiz
Posted: Thu Jul 17, 2008 3:17 pm
siren 
I explained how I came with the answer, you just had a lucky guess.
I explained how I came with the answer, you just had a lucky guess.
Re: Probability Quiz
Posted: Thu Jul 17, 2008 3:20 pm
RebelLion wrote:siren
I explained how I came with the answer, you just had a lucky guess.
RebelLion You're such a hater!
Re: Probability Quiz
Posted: Thu Jul 17, 2008 3:27 pm
siren
okay fine, you deserve credit you genius quruxley.
okay fine, you deserve credit you genius quruxley.
Re: Probability Quiz
Posted: Thu Jul 17, 2008 3:31 pm
RebelLion wrote:siren
okay fine, you deserve credit you genius quruxley.
Don't pacify me!