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becca2212 Group Title

How to solve a probabilitiy when it has or in the problem. Like P (A or B)?

  • 3 years ago
  • 3 years ago

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  1. mathTalk Group Title
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    Just add the probaility if they are disjoint however take out P(A and B) if the sets are not disjoint.

    • 3 years ago
  2. becca2212 Group Title
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    E.) was P (A and B) and then F.) is P (A or B). Earlier in the question I did P(A)=230/580 and P(B)=200/580. What should I do to find P (A or B)

    • 3 years ago
  3. mathTalk Group Title
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    P(A or B) =1-P'(AorB) =1- 150/580=430/580

    • 3 years ago
  4. becca2212 Group Title
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    I am sorry where did you get the 150 at?

    • 3 years ago
  5. mathTalk Group Title
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    total P = P(A)+p(B)+P'(A or B)

    • 3 years ago
  6. mathTalk Group Title
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    =1

    • 3 years ago
  7. becca2212 Group Title
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    So if I need to solve for P (B or D) and P (B) was 200/580 and P (D) was 250/580. How do I solve this one?

    • 3 years ago
  8. mathTalk Group Title
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    450/580

    • 3 years ago
  9. becca2212 Group Title
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    Why would the problems be so different? Why did I use 1- in the first one but the second one just added the top numbers?

    • 3 years ago
  10. mathTalk Group Title
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    I was wrong

    • 3 years ago
  11. mathTalk Group Title
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    P(A+B)= P(A)+P(B)-p(aandB)

    • 3 years ago
  12. becca2212 Group Title
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    I know you gave me the formula but I dont understand how you got 150 still.

    • 3 years ago
  13. mathTalk Group Title
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    sorry for confusing you. I was wrong there.

    • 3 years ago
  14. becca2212 Group Title
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    haha its ok I just dont get probability at all. So can we start over real quick. I need to find P (A or B). P (A) was 230/580 and P(B) was 200/580.

    • 3 years ago
  15. mathTalk Group Title
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    simply add the two probabilities ?

    • 3 years ago
  16. mathTalk Group Title
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    but i am not sure about the intersection.

    • 3 years ago
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