## anonymous one year ago According to the general equation for conditional probability, if P(A∩B)=3/7 and P(B)=7/8 , what is P(A|B) ?

1. butterflydreamer

http://prntscr.com/7sfwan <- this is your general equation

2. anonymous

hmmmm

3. kropot72

The formula needed is $\large P(A|B)=\frac{P(A\cap B)}{P(B)}$

4. butterflydreamer

|dw:1436849165374:dw|

5. anonymous

A. 40/49 B. 32/49 C. 16/49 D. 24/49

6. anonymous

looking for help dont have to tell the answer if you dont feel like it

7. anonymous

i really want to understand this complicated stuff

8. butterflydreamer

So all you need to do is simplify the fraction :) $\frac{ 3 }{ 7 } \div \frac{ 7 }{ 8 } = \frac{ 3 }{ 7 } \times \frac{ 8 }{ 7 } = ?$

9. butterflydreamer

you just substitute the values that is given (in the question) into the general formula (above) and then you work it out normally ^_^

10. anonymous

me = mind blown

11. anonymous

i dont understand sorry

12. UsukiDoll

we are given P(A∩B)=3/7 and P(B)=7/8 so we need to find out P(A|B) which there's a formula for that $$\color{blue}{\text{Originally Posted by}}$$ @kropot72 The formula needed is $\large P(A|B)=\frac{P(A\cap B)}{P(B)}$ $$\color{blue}{\text{End of Quote}}$$

13. anonymous

ohh its 24/49

14. anonymous

lol i was confused at first

15. butterflydreamer

we are given: $P(A∩B)=3/7$ and $P(B)=7/8$ We want to find : $P(A|B) =?$ To do this, we need to use the general formula for conditional probability: $P(A|B)=\frac{ P(A∩B) }{ P(B) }$

16. UsukiDoll

17. butterflydreamer

computer lagged xD but yass

18. anonymous

thanks guys :)

19. butterflydreamer

no problem :)

20. anonymous

i fanned ya :)

21. butterflydreamer

*thanks :)!

22. anonymous

:)