Mathematics (AS & A Level) · Oct / Nov 2017 · Paper 61 · Question 5

Over a period of time Julian finds that on long-distance flights he flies economy class on 82% of flights. On the rest of the flights he flies first class. When he flies economy class, the probability that he gets a good night’s sleep is x. When he flies first class, the probability that he gets a good night’s sleep is 0.9.

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