Mathematics for IGCSE & O level - Probability (Section 5 - No. 15)
Two events A and B are independent. P(A) = 0.4, P(B) = 0.3. What is the probability of either A or B occurring?
0.7
0.58
0.12
0.70
Selitys
P(A or B) = P(A) + P(B) - P(A) * P(B) = 0.4 + 0.3 - (0.4*0.3) = 0.7 - 0.12 = 0.58.