Mathematics (AS & A Level) · May / June 2025 · Paper 61 · Question 3
9709
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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 = t 2750 = / t 127000 2 = /
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3(a)[3]
3(b)[5]
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