What is the probability that the sample mean will be less

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The tensile strength of spot welds produced by a robot welder is normally distributed, with a mean of 10,000 psi and a standard deviation of 800 psi. For a simple random sample of n=4 welds, what is the probability that the sample mean will be at least 10,200 psi? What is the probability that the sample mean will be less than 9900 psi?

Reference no: EM13236368

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