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In the manufacturing process of a pharmaceutical product, repeated measurements follow a Normal distribution with mean ,u equal to the true product concentration, and with

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In the manufacturing process of a pharmaceutical product, repeated measurements follow a Normal distribution with mean ,u equal to the true product concentration, and with standard deviation 0 = 0.006 g/l. How many measurements would be needed to estimate the true concentration within 10.001 g/l with 99% condence? Give your answer rounded up to the nearest whole number. n

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