anonymous
  • anonymous
Is there another way to think through conditional probabilities without using a tree diagram?
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  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
When you say "think through", do you mean working out a specific exercise or understanding what conditional probabilities generally mean?
anonymous
  • anonymous
(I think I can help you in both cases!)
anonymous
  • anonymous
yes working out a specific excercise !?

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anonymous
  • anonymous
?? help
anonymous
  • anonymous
Okay there's a formula for the conditional probability, which is P(A|B) = P(A and B)/P(B)
anonymous
  • anonymous
Have you seen that before?
anonymous
  • anonymous
yes!
anonymous
  • anonymous
Okay, cool! Would you like me to take you through a specific example to see how it works, or does that sort out your problem?
anonymous
  • anonymous
no I was just wondering if there was another way besides using that formula ? But if you want to show me an example that would be great too :)
anonymous
  • anonymous
I can draw a picture, if it helps.
Hero
  • Hero
post the conditional probability problem you are working on and we can work through it.
anonymous
  • anonymous
|dw:1442528356799:dw|
anonymous
  • anonymous
P(A|B) means that you know for sure that B has happened, and you want to know the chance of A happening now.
anonymous
  • anonymous
If B has already happened, then you know that you're somewhere inside the circle on the right (in my drawing). To find the probability of A also happening, you need to see how big the area marked "A and B" is compared to the whole of the circle B.
anonymous
  • anonymous
That's why you get the formula P(A and B) / P(B).
anonymous
  • anonymous
Perfect! I think I understand it better haha. My professors sucks, but have a great day guys!
anonymous
  • anonymous
You too :)
Hero
  • Hero
Great job of explaining things @BasketWeave

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