Mathematics (AS & A Level) · Oct / Nov 2018 · Paper 71 · Question 3
9709
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A population has mean 12 and standard deviation 2.5. A large random sample of size n is chosen from this population and the sample mean is denoted by X. Given that PX < 12.2 = 0.975, correct to 3 significant figures, find the value of n. [4]
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