Mathematics (AS & A Level) · Oct / Nov 2021 · Paper 62 · Question 4
9709
As printed in the paper
The question as text
A certain kind of firework is supposed to last for 30 seconds, on average, after it is lit. An inspector suspects that the fireworks actually last a shorter time than this, on average. He takes a random sample of 100 fireworks of this kind. Each firework in the sample is lit and the time it lasts is noted.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
4(a)[1]
4(b)[5]
4(c)[1]
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