Mathematics for IGCSE & O level - Probability (Section 3 - No. 41)
If the probability of a train arriving on time is 0.7, what is the probability that the train is late on three consecutive days, assuming the events are independent?
0.3
0.027
0.21
0.7
解释
The probability of the train being late is 1 - 0.7 = 0.3. The probability for three consecutive days is 0.3 * 0.3 * 0.3 = 0.027.