Mathematics (AS & A Level) · May / June 2018 · Paper 73 · Question 5
9709
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The question as text
The time taken for a particular train journey is normally distributed. In the past, the time had mean 2.4 hours and standard deviation 0.3 hours. A new timetable is introduced and on 30 randomly chosen occasions the time for this journey is measured. The mean time for these 30 occasions is found to be 2.3 hours.
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5(i)[6]
5(ii)[2]
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