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3-206. A random sample of n = 9 structural elements is tested for compressive strength. We know that the true mean compressive strength u =

3-206. A random sample of n = 9 structural elements is tested for compressive strength. We know that the true mean compressive strength u = 5500 psi and the standard deviation is o = 100 psi. Find the probability that the sample mean com- pressive strength exceeds 4985 psi

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