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Probability

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Manager
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Probability [#permalink] New post 31 Mar 2013, 15:11
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I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?
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Re: Probability [#permalink] New post 01 Apr 2013, 02:46
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jumsumtak wrote:
score780 wrote:
I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?


Exactly!


Thanks man. So that would be: 1/3*1/2*3/4+2/3*1/2*3/4+2/3*1/2*1/4?
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Re: Probability [#permalink] New post 01 Apr 2013, 23:20
score780 wrote:
jumsumtak wrote:
score780 wrote:
I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?


Exactly!


Thanks man. So that would be: 1/3*1/2*3/4+2/3*1/2*3/4+2/3*1/2*1/4?



Yes. That would be the answer.
Re: Probability   [#permalink] 01 Apr 2013, 23:20
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