Mathematics (Syllabus D) · May / June 2019 · Paper 12 · Question 5
4024
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Lamps are made in a factory. A random sample of 50 of the lamps is tested and 4 of them are found to be faulty. A total of 4000 lamps is made in one day. Calculate the number of these 4000 lamps you would expect to be faulty. [2]
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