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A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5. psi and standard deviation 3.5 psi. What is

A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5. psi and standard deviation 3.5 psi. What is the standard deviation of the sample mean when the sample size is (a) n = 10 and (b) n = 45.

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