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 don't 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) รท (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 ...
- Physics - I'm writing a prac report, and I just need something clarified. The ...
- Physics - I'm writing a prac report, and I just need something clarified. The ...
- Algebra - Hey! I like math,but this year I'm doing algebra 1 and am not doing so...
- Algebra - Need help finding composition of functions. I am doing something wrong...
- Comm 100 college - Which of the following statements is true concerning finding ...
- Business - How can I create a new restaurant that follows a blue ocean strategy...
- Statistics - Excel - Can anyone help me with finding Standard Deviation in Excel...
- chem - Which statement is wrong? 1. Adding the same amount of heat to two ...
- Algebra II - For the : ax^2 + bx + c How would you get what to put in (_+_)(_+_...

More Related Questions