Mathematics for IGCSE & O level - Probability (Section 1 - No. 49)
If the train is on time for two out of the three days, what is the probability? (Assume the probability of the train being on time is 0.7)
0.21
0.441
0.7
0.063
説明
The probability is 3 * 0.7^2 * 0.3 = 0.441