Statistics Solutions

[Solution] The tensile strength of spot welds produced by a robot welder is normally distributed, with a mean of 10,000 pounds psi and a standard deviation

Question: The tensile strength of spot welds produced by a robot welder is normally distributed, with a mean of 10,000 pounds 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? Less than 9900 psi?

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