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becca2212

  • 4 years ago

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

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  1. mathTalk
    • 4 years ago
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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.

  2. becca2212
    • 4 years ago
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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. mathTalk
    • 4 years ago
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    P(A or B) =1-P'(AorB) =1- 150/580=430/580

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

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

  6. mathTalk
    • 4 years ago
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    =1

  7. becca2212
    • 4 years ago
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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?

  8. mathTalk
    • 4 years ago
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    450/580

  9. becca2212
    • 4 years ago
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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?

  10. mathTalk
    • 4 years ago
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    I was wrong

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

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

  13. mathTalk
    • 4 years ago
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    sorry for confusing you. I was wrong there.

  14. becca2212
    • 4 years ago
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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.

  15. mathTalk
    • 4 years ago
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    simply add the two probabilities ?

  16. mathTalk
    • 4 years ago
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    but i am not sure about the intersection.

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