Longlast inc. produces car batteries. the mean life of, Ask an Expert

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LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?

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Category:- Statistics and Probability
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