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
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