| Exam Board | OCR MEI |
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| Module | Paper 2 (Paper 2) |
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| Year | 2022 |
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| Session | June |
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| Topic | Proof |
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5 Tom conjectures that if \(n\) is an odd number greater than 1 , then \(2 ^ { n } - 1\) is prime.
Find a counter example to disprove Tom's conjecture.
\(6 X\) is a continuous random variable such that \(X \sim \mathrm {~N} \left( \mu , \sigma ^ { 2 } \right)\).
On the sketch of this Normal distribution in the Printed Answer Booklet, shade the area bounded by the curve, the \(x\)-axis and the lines \(x = \mu \pm \sigma\).