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The life in hours of a biomedical device under development in the laboratory is known to be approximately normally distributed. A random sample of 15

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The life in hours of a biomedical device under development in the laboratory is known to be approximately normally distributed. A random sample of 15 devices is selected and found to have an average life of 5.648.8 hours and a sample standard deviation of 223.6 hours. Give the lower bound fora 99. confidence interval on the mean

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