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LRCA Corp. manufactures car batteries that have a lifetime that is approximately normally distributed with a mean of 8760 hours and a standard deviation of

LRCA Corp. manufactures car batteries that have a lifetime that is approximately normally distributed with a mean of 8760 hours and a standard deviation of 70 hours. Compute for the test statistic if a random sample of 50 has an average of 8650 hours

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