Mathematics (AS & A Level) · May / June 2022 · Paper 63 · Question 3
9709
As printed in the paper
The question as text
Batteries of type A are known to have a mean life of 150 hours. It is required to test whether a new type of battery, type B, has a shorter mean life than type A batteries.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[1]
3(b)[5]
3(c)[3]
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