Mathematics (AS & A Level) · Oct / Nov 2025 · Paper 63 · Question 3
9709
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The data produced by a certain data entry firm always include a small number of incorrect characters that occur at random. The proportion of incorrect characters is denoted by p, and experience has shown that . p 0 0001 = . A particular data set from the firm contains 14 500 characters, of which X characters are incorrect.
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3(a)[3]
3(b)[3]
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