Higher Paper 2
Edexcel – higher
Question 10:
\[ \begin{array}{l}\text{Maria has to complete two driving tests.} \\ \text{The probability that she will pass the first test is 0.8.} \\ \text{If she passes the first test the probability she will pass the second test is 0.9.} \\ \text{If she fails the first test the probability she will pass the second test is 0.7.}\end{array} \]
(a) \( \text{Complete the probability tree diagram for this information.} \) (2 marks)
(b) \( \text{Work out the probability that Maria passes at least one of the tests.} \) (3 marks)