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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 Dec 2007 22:26:36 IST
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heres a question on probability!! in a school there are 1000 students out of which 430 are girls. it is known that out of 430, 10% of girls study in class XII. wat is the probability that a student chosen randomly studies in class XII given that the chosen student is a girl?? plz, give an explained solution to this. i didnt get the question.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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4 Dec 2007 22:37:25 IST
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is the answer 1/10 ? not sure though........
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4 Dec 2007 22:38:39 IST
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yes!!! how did u get it. plz xplain fully.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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4 Dec 2007 22:41:57 IST
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it's a ques on conditional prob
let event A be defined as choosing a girl from the given students
let event B be defined as choosing a student of twelfth standard
now we have to find prob of (B given A) dentoted as P(B/A) = P(A intersection B)/P(A) = 43/430 = 1/10
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4 Dec 2007 22:42:58 IST
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Good answer !!!!!!!! Priyesh !!!!!!!!!
Cheers!!!!!!!!!@@@!!!!!!!!!
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Always available for help !
But Remember Don't hesitate to ask a good Question but
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4 Dec 2007 22:45:06 IST
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see, by simple logic..........once u knw that the person chosen is a gal..........rest ppl are immaterial.........ab usmein se kitne XII mein hain ? 10% na ? thats the answer then
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4 Dec 2007 22:47:14 IST
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p(A intersectionB) will be 43??
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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4 Dec 2007 22:47:18 IST
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Given that the student is a girl then total persons that can be chosen = 430
out of that, 10% are in 12th..
so probability of getting a girl from 12th standard = 10%
= 10/100 = 1/10
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- Gaurav Ragtah (spideyunlimited)
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4 Dec 2007 22:47:58 IST
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yes! got it. thanks to all!!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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4 Dec 2007 22:49:07 IST
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yes p(A intersection B) will be probabilty of choosing a girl who is in 12th standard.. where A is event of choosing a girl and B is event of choosing a person from 12th standard.
now given that 10% of girls are from 12th.. and 430 girls are the total number so girls in 12th are 43 (10% of 430)
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- Gaurav Ragtah (spideyunlimited)
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4 Dec 2007 23:01:06 IST
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total no. of girls = 430 no. of students studying in 12th = 10% = 43 probability of selecting a 12th class girl = no. of girls in 12th / tot. no. of girls = 43/430 ans= 1/10 rate if useful
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