Posted by **Christina** on Wednesday, April 22, 2009 at 9:31pm.

If P(a)=1/5, P(A and B)= 1/8, what is P(b/a)

i dont get it is it the same way as finding p or b or is it something entirely different and how do you find it

- Algebra 2 -
**Reiny**, Wednesday, April 22, 2009 at 9:46pm
I think you are dealing with "conditional probability"

usually written as P(B│A) and read as

"the probability of B given A"

P(B│A) = P(A and B)/P(A)

= (1/8) / (1/5)

= 5/8

- Algebra 2 -
**Christina**, Wednesday, April 22, 2009 at 9:49pm
so it would be division then i would have to cross multiply right??? by the way thank you...Alot!

- Algebra 2 -
**Reiny**, Wednesday, April 22, 2009 at 10:08pm
You are dividing 2 fractions at the end

(1/8) / (1/5)

= (1/8) ÷ (1/5)

= (1/8)x(5/1)

= 5/8

## Answer this Question

## Related Questions

- English - I have a question about quoting. If I have a sentence like: Something ...
- geology (urgent) - i am having trouble finding how a shield volcano erupts and ...
- French - SraJMcGin/Frenchy - Aimes-vous peinture " Girl before a Mirror - ...
- Algebra - Hey! I like math,but this year I'm doing algebra 1 and am not doing so...
- thanks - THANK YOU SO MUCH EVERYONE FOR SHOWING ME THAT ALGEBRA EQUATION ...
- algebra - can someone help me solve this problem? What is the value of x? (3+2)(...
- Math - need to describe 3 different problem solving approaches to this problem, ...
- chem - Which statement is wrong? 1. Adding the same amount of heat to two ...
- Chemistry - Sorry for posting this again, I dont know if the question was ...
- math - Sam took traveled 8 hrs to his sisters house. The return trip took 7 hrs ...

More Related Questions