Mathematics (AS & A Level) · Feb / March 2022 · Paper 62 · Question 4
9709
As printed in the paper
The question as text
In the past the time, in minutes, taken by students to complete a certain challenge had mean 25.5 and standard deviation 5.2. A new challenge is devised and it is expected that students will take, on average, less than 25.5 minutes to complete this challenge. A random sample of 40 students is chosen and their mean time for the new challenge is found to be 23.7 minutes.
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4(a)[5]
4(b)[1]
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