rmally distributed operating lives. What’s the 95% confidence interval for the unknown mean of the working life of the entire population of batteries?

Q2. A random sample of n = 10 flash light batteries with a mean operating life X=5 hr. And a sample standard deviation S = 1 hr. is picked from a production line known to produce batteries with normally distributed operating lives. What’s the 95% confidence interval for the unknown mean of the working life of the entire population of batteries?

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