Mathematics (AS & A Level) · Oct / Nov 2019 · Paper 61 · Question 7
9709
As printed in the paper
The question as text
The shortest time recorded by an athlete in a 400 m race is called their personal best (PB). The PBs of the athletes in a large athletics club are normally distributed with mean 49.2 seconds and standard deviation 2.8 seconds.
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7(i)[4]
7(ii)[3]
7(iii)[3]
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