Mathematics for IGCSE & O level - Probability (Section 1 - No. 41)
If the probability of a train arriving on time is 0.7, and the probability of the train being late is 0.3. What is the probability that the train is late on the first two days, but on time on the third day? (Independent events)
0.063
0.09
0.21
0.7
คำอธิบาย
The events are independent, so the combined probability is calculated by: 0.3 * 0.3 * 0.7 = 0.063