Mathematics (AS & A Level) · May / June 2026 · Paper 62 · Question 6
9709
As printed in the paper
The question as text
The length of time, T minutes, that customers spend in a certain shop has the distribution N( n, 9.2). Last year the value of n was 12.4. The manager of the shop wants to test whether the value of n has decreased this year. She chooses a random sample of 75 customers and finds that the sample mean, T , for these customers is 11.9.
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6(a)[5]
6(b)[1]
6(c)[3]
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