Given P( A and B)=0.1 and P(A)=0.3, find P(B I A)?

Answer 1

Dear NUMBA 85,

Conditional probability P(B | A) can be written as

P(B | A) = P(A & B) / P(A),

when P(A) is not equal to 0.

Thus,

P(B | A) = 0.1 / 0.3 = 1/3.