A-LevelMathematicsProbability and statisticsMay/June 2025Paper 6 Q38 Marks
The time, T minutes, for a certain daily bus journey is normally distributed. The bus company claims that the mean of T is 45. A passenger believes that the mean of T is actually greater than 45. She notes the times taken for this journey on a random sample of 60 days. The results are summarised below. n = 60 ΣT = 2750 ΣT² = 127000
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