Given : P(A) = 0.25 P(B) = 0.4 and P(A or B) = 0.5
(i) We know, P(A or B) = P(A) + P(B) – P(A and B)
Substituting values in the above formula, we get
0.5 = 0.25 + 0.4 – P(A and B)
0.5 = 0.65 – P(A and B)
P(A and B) = 0.65 – 0.5
P(A and B) = 0.15
(ii)