Question

If p(a|b) = 0.40 and p(b) = 0.30, find p(a ∩ b). .171 .525 .571 .120

Answer 1

P(A|B)=P(A ∩ B)/P(B)   (by definition of conditional probability)
=>
P(A ∩ B) = P(A|B) * P(B)
=0.40*0.30
=0.120