Mathematics (AS & A Level) · May / June 2018 · Paper 72 · Question 3
9709
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The question as text
The management of a factory wished to find a range within which the time taken to complete a particular task generally lies. It is given that the times, in minutes, have a normal distribution with mean - and standard deviation 6.5. A random sample of 15 employees was chosen and the mean time taken by these employees was found to be 52 minutes.
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3(i)[3]
3(ii)[1]
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