Mathematics (AS & A Level) · May / June 2025 · Paper 65 · Question 7
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The question as text
A firm makes a certain type of battery-powered toy. The battery life is denoted by X hours and the population mean of X is supposed to be 12. The Quality Control department wished to test whether the population mean of X is actually less than 12. They tested a random sample of 50 of these toys and found that the sample mean, X , was 11.4.
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7(a)[1]
7(b)[2]
7(c)[2]
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