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#1 2010-02-20 07:23:15
- iamfriendly
- Member
- Registered: 2009-07-03
- Posts: 72
Probability related.....probably
Say 2 indentical bags contain different numbers of 
and 
counters.
A bag is chosen AT RANDOM and a single counter removed from it without looking.
bag A : 2 3
Bag B : 3 4
If the counter was what was the probability that the bag was Bag A?? 
EYE AM FRIENDLY, THAT'S O U NEED 2 NO,
psst,
Don't trust strangers, EYE AM FRIENDLY, THAT'S O U NEED 2 NO ..........psst, Don't trust strangers......
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#2 2010-02-20 07:35:23
- iamfriendly
- Member
- Registered: 2009-07-03
- Posts: 72
Re: Probability related.....probably
I got
2 any different anwsers? please HELP
5
EYE AM FRIENDLY, THAT'S O U NEED 2 NO,
psst,
Don't trust strangers, EYE AM FRIENDLY, THAT'S O U NEED 2 NO ..........psst, Don't trust strangers......
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#3 2010-02-20 10:44:16
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: Probability related.....probably
The probability of choosing bag A, then getting a from it is 1/2 * 2/5 = 1/5.
The probability of choosing bag B, then getting a from it is 1/2 * 3/7 = 3/14.
The overall probability of getting a is the sum of these two, which is 29/70.
Therefore, given that you picked a , the probability of you having chosen bag A is
(1/5) / (29/70) = 14/29.
Why did the vector cross the road?
It wanted to be normal.
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#4 2010-02-27 12:33:13
- iamfriendly
- Member
- Registered: 2009-07-03
- Posts: 72
Re: Probability related.....probably
Thank you very much
EYE AM FRIENDLY, THAT'S O U NEED 2 NO,
psst,
Don't trust strangers, EYE AM FRIENDLY, THAT'S O U NEED 2 NO ..........psst, Don't trust strangers......
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