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Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is...

Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed and that σ = 8.7 psi. A random sample of nine specimens is tested, and the average breaking strength is found to be 86.5 psi. The 95% confidence interval for the true mean breaking strength is written as (A ; B). Find the value of A? round your answer to three digits.

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