| Exam Board | CAIE |
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| Module | S2 (Statistics 2) |
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| Year | 2023 |
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| Session | November |
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| Topic | Linear combinations of normal random variables |
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| Type | Distribution of sample mean |
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1 A random variable \(X\) has the distribution \(\mathrm { N } ( 410,400 )\).
Find the probability that the mean of a random sample of 36 values of \(X\) is less than 405.