Mathematics (AS & A Level) · Oct / Nov 2021 · Paper 51 · Question 3
9709
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For her bedtime drink, Suki has either chocolate, tea or milk with probabilities 0.45, 0.35 and 0.2 respectively. When she has chocolate, the probability that she has a biscuit is 0.3. When she has tea, the probability that she has a biscuit is 0.6. When she has milk, she never has a biscuit. Find the probability that Suki has tea given that she does not have a biscuit. [5]
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