Problem #5: The breaking strength of yarn used in the production of woven carpet material is normally distributed. A random sample of 4 specimens of yarn from a production run is measured for breaking strength, and the standard deviation is found to be 2.4. Also, a confidence interval for the true mean breaking strength u is calculated to be (128.058158, 138.081842). What is the confidence level for this interval? Problem #5: answer as a percentage correct to 2 decimals, e.g., 82.50

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