(i)[2]
Draw a tree diagram with full labels to show this information.
(ii)[3]
Find the probability that Ayman’s breakfast drink is coffee, given that his drink contains milk.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
Ayman’s breakfast drink is tea, coffee or hot chocolate with probabilities 0.65, 0.28, 0.07 respectively. If he has tea, the probability that it includes milk is 0.8. If he has coffee, the probability that it includes milk is 0.5. If he has hot chocolate, it always contains milk.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct probability tree layout with either one branch after HC or two branches with 0 probability displayed correctly; clear labels and annotation” …
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