Mathematics (AS & A Level) · Feb / March 2020 · Paper 62 · Question 1
9709
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The booklets produced by a certain publisher contain, on average, 1 incorrect letter per 30 000 letters, and these errors occur randomly. A randomly chosen booklet from this publisher contains 12 500 letters. Use a suitable approximating distribution to find the probability that this booklet contains at least 2 errors. [3]
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