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B. A machine produces a component of a product with a standard deviation of 1.6 cm in length. A random sample of 64 components was

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B. A machine produces a component of a product with a standard deviation of 1.6 cm in length. A random sample of 64 components was selected found to have a mean length of 90 cm. Find the 95% confidence interval for the true mean length of all the components produced

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