Question

If P(A) = 0.8, P(B) = 0.5 and P(B/A) = 0.4, then find: 

(i) P(A ∩B) 

(ii) P(A/B) 

(iii) P(A ∪ B)

Answer 1

(iii) P(A ∪B) = P(A) + P(B) -P(A ∩B) 

= 0.8 + 0.5 – 0.32 

= 1.3 – 1.32 

= 0.98