anonymous
  • anonymous
How to solve a probabilitiy when it has or in the problem. Like P (A or B)?
Mathematics
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anonymous
  • anonymous
How to solve a probabilitiy when it has or in the problem. Like P (A or B)?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Just add the probaility if they are disjoint however take out P(A and B) if the sets are not disjoint.
anonymous
  • anonymous
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)
anonymous
  • anonymous
P(A or B) =1-P'(AorB) =1- 150/580=430/580

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anonymous
  • anonymous
I am sorry where did you get the 150 at?
anonymous
  • anonymous
total P = P(A)+p(B)+P'(A or B)
anonymous
  • anonymous
=1
anonymous
  • anonymous
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?
anonymous
  • anonymous
450/580
anonymous
  • anonymous
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?
anonymous
  • anonymous
I was wrong
anonymous
  • anonymous
P(A+B)= P(A)+P(B)-p(aandB)
anonymous
  • anonymous
I know you gave me the formula but I dont understand how you got 150 still.
anonymous
  • anonymous
sorry for confusing you. I was wrong there.
anonymous
  • anonymous
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.
anonymous
  • anonymous
simply add the two probabilities ?
anonymous
  • anonymous
but i am not sure about the intersection.

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