On a particular route, the probability that a bus is late on a wet day is 0.35, and the probability that it is late on a dry day is 0.12. The probability of a wet day is 0.30.
Find the probability that the bus is late.
The model assumes that each day's weather is independent of the weather on previous days. Explain why this may be unrealistic.
164 exam-style questions on WJEC A Level Maths 4.1 Probability (A-level only), covering 4.1.1 Probability (A-level only), 4.1.2 Probability (A-level only), and 4.1.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.