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prob in school girls

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prob in school girls

by maihuna » Fri Aug 14, 2009 8:25 am
In a school, there are 1000 students, out of which 430 are girls. It is known
that out of 430, 10% of the girls study in class XII. What is the probability that a student chosen randomly studies in Class XII given that the chosen student is a girl?

0.043
0.1
0.2
0.25
0.43
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by ankitns » Fri Aug 14, 2009 8:56 am
If it is given that the chosen student is a girl, we know that it is one of the 430 girls. If 10% of these girls are class XII students, then the probability that the student chose randomly is [spoiler]10% = 10/100 = 0.1[/spoiler]

In a school, there are 1000 students, out of which 430 are girls. It is known
that out of 430, 10% of the girls study in class XII. What is the probability that a student chosen randomly studies in Class XII given that the chosen student is a girl?

0.043
0.1
0.2
0.25
0.43
Attempt 1: 710, 92% (Q 42, 63%; V 44, 97%)
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by kaulnikhil » Fri Aug 14, 2009 12:39 pm
43/430 = .1
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