Mathematics for IGCSE & O level - Probability (Section 8 - No. 7)
If the probability that Sarah's bus is late on any given day is 0.2, what is the probability that her bus is late on just one of the two days?
0.04
0.16
0.32
0.36
Explication
Using a tree diagram: (0.2 * 0.8) + (0.8 * 0.2) = 0.32