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Need help with probability problem

Discussion in 'BBS Hangout' started by mrm32, Jun 2, 2012.

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  1. mrm32

    mrm32 Member

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    This is the problem:

    I'm having trouble figuring this out. Anyone able to help would be much appreciated.
     
    #1 mrm32, Jun 2, 2012
  2. KingCheetah

    KingCheetah Atomic Playboy

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    You should ask Boy of Misery.
     
    #2 KingCheetah, Jun 2, 2012
  3. Tree-Mac

    Tree-Mac Member

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    P(A) = accounting = 0.4
    P(B) = statistics = 0.5
    P(A and B) = both = 0.3

    P(A or B) = P(A) + P(B) - P(A and B) = in accounting or statistics or both = 0.4 + 0.5 - 0.3 = 0.6
     
    #3 Tree-Mac, Jun 2, 2012
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  4. Air Langhi

    Air Langhi Contributing Member

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    shouldn't the 1st three just be 40,50,30?

    I think the last one should be 60.

    But could be completely wrong because that seems too obvious. What level of math are you doing?
     
    #4 Air Langhi, Jun 2, 2012
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  5. Tree-Mac

    Tree-Mac Member

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    Must be a developmental math class.
     
    #5 Tree-Mac, Jun 2, 2012
  6. Jontro

    Jontro Member

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    What kind of wizardry question is this?











    and I got a B+ in college algebra so I know my stuff
     
    #6 Jontro, Jun 2, 2012
  7. mrm32

    mrm32 Member

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    Thanks for the feedback guys. This is actually a review for a statistics class. I guess I was trying to read too much into the problem that I didn't realize the first 3 were that simple.
     
    #7 mrm32, Jun 2, 2012
  8. mrm32

    mrm32 Member

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    Its a review for a Quantitative Methods for Management class (class after Statistics). I took Stats last fall so I'm brushing up on old concepts. I've always hated these type of probability questions.
     
    #8 mrm32, Jun 2, 2012
  9. durvasa

    durvasa Member

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    The answers to the first 3 questions are already given to you in the problem. :)

    If 30% are in both and 40% are in accounting, than 10% are in accounting but not statistics..

    If 30% are in both and 50% are in statistics, than 20% are in statistics but not accounting.

    P(statistics or accounting) = P(statistics but not accounting) + P(accounting but not statistics) + P(statistics and accounting) = P(statistics) + P(accounting) - P(statistics and accounting)
     
    #9 durvasa, Jun 2, 2012
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  10. Commodore

    Commodore Member

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    #10 Commodore, Jun 2, 2012
  11. Third eye

    Third eye Member

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    This although I did quickly in head might have skipped a step if there was a trick question ....but pretty basic the info is all given to ya there
     
    #11 Third eye, Jun 2, 2012
  12. sinobball

    sinobball Member

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    Meh, you should be asking and solving questions like these

    1) What is the probability that 2 randomly chosen students are classmates in either the accounting class or the statistics class? Assuming student size is large (>1000).

    2) What is the probability that 2 out of 3 randomly chosen students are classmates in either the accounting class or the statistics class? Assuming student is large (>1000).
     
    #12 sinobball, Jun 2, 2012
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