Mathematics (AS & A Level) · May / June 2021 · Paper 51 · Question 2
9709
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A company produces a particular type of metal rod. The lengths of these rods are normally distributed with mean 25.2 cm and standard deviation 0.4 cm. A random sample of 500 of these rods is chosen. How many rods in this sample would you expect to have a length that is within 0.5 cm of the mean length? [5]
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