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anonymous

  • 5 years ago

find the indicated probablity if p(a and b)=0.5 p(a)=0.7 and p(b)=0.5 find p(a or b)

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  1. anonymous
    • 5 years ago
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    If p(a)=.7, then p=.7/a if p(b)=.5, then p=.5/a right so far?

  2. anonymous
    • 5 years ago
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    yes

  3. anonymous
    • 5 years ago
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    so you need to find p of a&b? so p(ab)?

  4. anonymous
    • 5 years ago
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    it only says p( a or b)

  5. M
    • 5 years ago
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    are you sure p(a and b) = 0.5

  6. anonymous
    • 5 years ago
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    yeah that's what it says if P(a and B)=0.5

  7. M
    • 5 years ago
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    do you have the answer? is it 0.7?

  8. anonymous
    • 5 years ago
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    I am trying to figure it out still

  9. anonymous
    • 5 years ago
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    I think for 'or' you add the probibility

  10. anonymous
    • 5 years ago
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    would it be 0.7?

  11. M
    • 5 years ago
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    i think so

  12. anonymous
    • 5 years ago
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    .5/a+.7/b then? So p=.5/a and p=.7/b Would that be the final answer? Trying to understand this one too.

  13. M
    • 5 years ago
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    if A = .5 and if B = .7 and P(A and B) = .5 that means A overlaps completely over B P(A or B) = P(A) + P(B) + P(A and B) = 0.7

  14. dumbcow
    • 5 years ago
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    M is correct

  15. anonymous
    • 5 years ago
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    Ignore my answer then, not bad for a first shot at a probability problem though ;)

  16. dumbcow
    • 5 years ago
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    wait typo should be a "-" P(A or B) = P(A) + P(B) - P(A and B) = 0.7

  17. M
    • 5 years ago
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    last equation i wrote is wrong sorry

  18. anonymous
    • 5 years ago
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    Ok I have a new single die one if u guys wanna look at it

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